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DocumentDisturbed dreaming and sleep quality: Altered sleep architecture in subjects with frequent nightmares2012

Reference code: PT/FB
Entity holding: BIAL Foundation
Location: S. Mamede do Coronado
Title:
BIAL Foundation Archive
Start date: 1994
History:
The BIAL Foundation was created in 1994 by Laboratórios BIAL in conjunction with the Council of Rectors of Portuguese Universities. BIAL’s Foundation mission is to foster the scientific study of Man from both the physical and spiritual perspectives.
Along the years the BIAL Foundation has developed an important relationship with the scientific community, first in Portugal and after worldwide. Today it is an institution of reference which aims to stimulate new researches that may help people, promote more health and contribute to new milestones to gain access to knowledge.
Among its activities the BIAL Foundation manages the BIAL Award, created in 1984, one of the most important awards in the Health field in Europe. The BIAL Award rewards both the basic and the clinical research distinguishing works of major impact in medical research.
The BIAL Foundation also assigns Scientific Research Scholarships for the study of neurophysiological and mental health in people, arousing the interest of researchers in the areas of Psychophysiology and Parapsychology.
To date the BIAL Foundation has supported 461 projects, more than 1000 researchers, with research groups in twenty-seven countries, resulting, until April 2013, in about 600 full papers, out of which 172 published in indexed international journals with an average impact factor of 3.6 and a substantial number of citations (1665).
Since 1996 the BIAL Foundation organizes the Symposia entitled "Behind and Beyond the Brain", a Forum that gathers well renowned neurosciences speakers and the BIAL Foundation Fellows which are spread around the world.
Classified as an institution of public utility, the BIAL Foundation includes among its patrons the Portuguese President, the Portuguese Universities Rectors' Council and the Portuguese Medical Association.
URL: http://www.bial.com/pt/
Accessibility: By permission

Reference code: PT/FB/BL
Entity holding: BIAL Foundation
Title: BIAL Grants
Start date: 1994
History:
In 1994 the BIAL Foundation launched a programme of science research grants with the aim of encouraging the research into Man’s physical and mental processes, namely in fields still largely unexplored but which warrant further scientific analysis, as Psychophysiology and Parapsychology.
Since its launch, applications to the BIAL grants have been increasing. Up to now 461 projects have been supported, involving more than 1000 researchers from 27 countries.
The approved applications have benefited from grants in amounts comprised between €5,000 and €50, 000. The amount to be granted is fixed by the Scientific board according to the needs of each project.
The supported projects have originated, until April 2013, in about 600 full papers, 172 out of which were published in indexed international journals with an average impact factor of 3.6 and a substantial number of citations (1665).
Among the BIAL Foundation fellows is worth highlighting the presence of scientists from prestigious universities from the United States, United Kingdom, Australia, Russia, Germany, Japan, France, Canada, and many others.
The BIAL grants are promoted biannually.

Reference code: PT/FB/BL-2010
Location: Arquivo PCA - Pastas 1 a 23
Title:
2010 Grants
Start date: 2011-01

Reference code: PT/FB/BL-2010-055
Location: Arquivo PCA - Pasta 11/2010
Title:
055 - The developmental and psychophysiological emergence of dreams and nightmares: state-dependent and state-independent fronto-cortical disconnectivity
Duration: 2011-03 - 2014-02
Researcher(s):
Róbert Bódizs, Peter Daniel Simor, Piroska Sándor, Szilvia Csóka, Klára Horváth
Institution(s): Institute of Behavioural Sciences, Semmelweis University, Budapest (Hungary)
Contents: Contents:
Bursary agreement
Application form
Correspondence
Financial report and expenditure documents
Progress report
Final reports
7 Articles ( published or submittedr publication)
5 Conference abstracts
Language: eng
Author:
Bódizs, R.
Secondary author(s):
Simor, P., Sándor, P., Csóka, S., Horváth, K.
Number of reproductions:
1
Keywords:
Psychophysiology / Sleep and Dreams / Biopsychological problems / Mental health / Sleep disorders / Brain structure and function / Developmental psychology

Reference code: PT/FB/BL-2010-055.02
Location: Arquivo PCA - Pasta 10/2010
Title:
Disturbed dreaming and sleep quality: Altered sleep architecture in subjects with frequent nightmares
Publication year: 2012
URL:
http://link.springer.com/article/10.1007%2Fs00406-012-0318-7
Abstract/Results: ABSTRACT:
Nightmares are intense, emotionally negative mental experiences that usually occur during late-night sleep and result in abrupt awakenings. Questionnaire-based studies have shown that nightmares are related to impaired sleep quality; however, the polysomnographic profile of nightmare subjects has been only scarcely investigated. We investigated the sleep architecture of 17 individuals with frequent nightmares and 23 control subjects based on polysomnographic recordings of a second night spent in the laboratory after an adaptation night. Nightmare subjects in comparison with control subjects were characterized by impaired sleep architecture, as reflected by reduced sleep efficiency, increased wakefulness, a reduced amount of slow wave sleep, and increased nocturnal awakenings, especially from Stage 2 sleep. While these differences were independent of the effects of waking psychopathology, nightmare subjects also exhibited longer durations of REM sleep that was mediated by heightened negative affect. Our results support that nightmares are related to altered sleep architecture, showing impaired sleep continuity and emotion-related increase in REM propensity.
Accessibility: Document exists in file
Copyright/Reproduction:
By permission
Language:
eng
Author:
Simor, P.
Secondary author(s):
Horváth, K., Gombos, F., Takács, K., Bódizs, R.
Document type:
Article
Number of reproductions:
1
Reference:
Simor, P., Horváth, K., Gombos, F., Takács, K., & Bódizs, R. (2012). Disturbed dreaming and sleep quality: Altered sleep architecture in subjects with frequent nightmares. European Archives of Psychiatry and Clinical Neuroscience, 262(8), 687-696. https://doi.org/10.1007/s00406-012-0318-7
2-year Impact Factor: 3.200|2012
Times cited: 74|2025-09-10
Indexed document: Yes
Quartile: Q2
Keywords: Nightmares / Sleep / Dreaming / Electroencephalogram (EEG) / Polysomnography / Sleep quality

Disturbed dreaming and sleep quality: Altered sleep architecture in subjects with frequent nightmares

Disturbed dreaming and sleep quality: Altered sleep architecture in subjects with frequent nightmares
DocumentObjective and subjective components of the first-night effect in young nightmare sufferers and healthy participants2013

Reference code: PT/FB
Entity holding: BIAL Foundation
Location: S. Mamede do Coronado
Title:
BIAL Foundation Archive
Start date: 1994
History:
The BIAL Foundation was created in 1994 by Laboratórios BIAL in conjunction with the Council of Rectors of Portuguese Universities. BIAL’s Foundation mission is to foster the scientific study of Man from both the physical and spiritual perspectives.
Along the years the BIAL Foundation has developed an important relationship with the scientific community, first in Portugal and after worldwide. Today it is an institution of reference which aims to stimulate new researches that may help people, promote more health and contribute to new milestones to gain access to knowledge.
Among its activities the BIAL Foundation manages the BIAL Award, created in 1984, one of the most important awards in the Health field in Europe. The BIAL Award rewards both the basic and the clinical research distinguishing works of major impact in medical research.
The BIAL Foundation also assigns Scientific Research Scholarships for the study of neurophysiological and mental health in people, arousing the interest of researchers in the areas of Psychophysiology and Parapsychology.
To date the BIAL Foundation has supported 461 projects, more than 1000 researchers, with research groups in twenty-seven countries, resulting, until April 2013, in about 600 full papers, out of which 172 published in indexed international journals with an average impact factor of 3.6 and a substantial number of citations (1665).
Since 1996 the BIAL Foundation organizes the Symposia entitled "Behind and Beyond the Brain", a Forum that gathers well renowned neurosciences speakers and the BIAL Foundation Fellows which are spread around the world.
Classified as an institution of public utility, the BIAL Foundation includes among its patrons the Portuguese President, the Portuguese Universities Rectors' Council and the Portuguese Medical Association.
URL: http://www.bial.com/pt/
Accessibility: By permission

Reference code: PT/FB/BL
Entity holding: BIAL Foundation
Title: BIAL Grants
Start date: 1994
History:
In 1994 the BIAL Foundation launched a programme of science research grants with the aim of encouraging the research into Man’s physical and mental processes, namely in fields still largely unexplored but which warrant further scientific analysis, as Psychophysiology and Parapsychology.
Since its launch, applications to the BIAL grants have been increasing. Up to now 461 projects have been supported, involving more than 1000 researchers from 27 countries.
The approved applications have benefited from grants in amounts comprised between €5,000 and €50, 000. The amount to be granted is fixed by the Scientific board according to the needs of each project.
The supported projects have originated, until April 2013, in about 600 full papers, 172 out of which were published in indexed international journals with an average impact factor of 3.6 and a substantial number of citations (1665).
Among the BIAL Foundation fellows is worth highlighting the presence of scientists from prestigious universities from the United States, United Kingdom, Australia, Russia, Germany, Japan, France, Canada, and many others.
The BIAL grants are promoted biannually.

Reference code: PT/FB/BL-2010
Location: Arquivo PCA - Pastas 1 a 23
Title:
2010 Grants
Start date: 2011-01

Reference code: PT/FB/BL-2010-055
Location: Arquivo PCA - Pasta 11/2010
Title:
055 - The developmental and psychophysiological emergence of dreams and nightmares: state-dependent and state-independent fronto-cortical disconnectivity
Duration: 2011-03 - 2014-02
Researcher(s):
Róbert Bódizs, Peter Daniel Simor, Piroska Sándor, Szilvia Csóka, Klára Horváth
Institution(s): Institute of Behavioural Sciences, Semmelweis University, Budapest (Hungary)
Contents: Contents:
Bursary agreement
Application form
Correspondence
Financial report and expenditure documents
Progress report
Final reports
7 Articles ( published or submittedr publication)
5 Conference abstracts
Language: eng
Author:
Bódizs, R.
Secondary author(s):
Simor, P., Sándor, P., Csóka, S., Horváth, K.
Number of reproductions:
1
Keywords:
Psychophysiology / Sleep and Dreams / Biopsychological problems / Mental health / Sleep disorders / Brain structure and function / Developmental psychology

Reference code: PT/FB/BL-2010-055.05
Location: Arquivo PCA - Pasta 10/2010
Title:
Objective and subjective components of the first-night effect in young nightmare sufferers and healthy participants
Publication year: 2013
URL:
http://www.tandfonline.com/doi/full/10.1080/15402002.2013.829062#.UsGhgdGYYq4
Abstract/Results: ABSTRACT:
The first-night effect—marked differences between the first- and the second-night sleep spent in a laboratory—is a widely known phenomenon that accounts for the common practice of excluding the first-night sleep from any polysomnographic analysis. The extent to which the first-night effect is present in a participant, as well as its duration (1 or more nights), might have diagnostic value and should account for different protocols used for distinct patient groups. This study investigated the first-night effect on nightmare sufferers (NM; N = 12) and healthy controls (N = 15) using both objective (2-night-long polysomnography) and subjective (Groningen Sleep Quality Scale for the 2 nights spent in the laboratory and 1 regular night spent at home) methods. Differences were found in both the objective (sleep efficiency, wakefulness after sleep onset, sleep latency, Stage-1 duration, Stage-2 duration, slow-wave sleep duration, and REM duration) and subjective (self-rating) variables between the 2 nights and the 2 groups, with a more pronounced first-night effect in the case of the NM group. Furthermore, subjective sleep quality was strongly related to polysomnographic variables and did not differ among 1 regular night spent at home and the second night spent in the laboratory. The importance of these results is discussed from a diagnostic point of view.
Accessibility: Document exists in file
Copyright/Reproduction:
By permission
Language:
eng
Author:
Kis, A.
Secondary author(s):
Szakadát, S., Simor, P., Gombos, F., Horváth, K., Bódizs, R.
Document type:
Article
Number of reproductions:
1
Reference:
Kis, A., Szakadát, S., Simor, P., Gombos, F., Horváth, K., & Bódizs, R. (2013). Objective and subjective components of the first-night effect in young nightmare sufferers and healthy participants. Behavioral Sleep Medicine, 12, 1-12. https://doi.org/10.1080/15402002.2013.829062
2-year Impact Factor: 1.744|2013
Times cited: 20|2025-09-10
Indexed document: Yes
Quartile: Q3
Keywords: First-night effect / Polysomnography / Nightmares / Sleep

Objective and subjective components of the first-night effect in young nightmare

Objective and subjective components of the first-night effect in young nightmare
DocumentREM sleep EEG theta activity is a negative correlate of attachment anxiety2011

Reference code: PT/FB
Entity holding: BIAL Foundation
Location: S. Mamede do Coronado
Title:
BIAL Foundation Archive
Start date: 1994
History:
The BIAL Foundation was created in 1994 by Laboratórios BIAL in conjunction with the Council of Rectors of Portuguese Universities. BIAL’s Foundation mission is to foster the scientific study of Man from both the physical and spiritual perspectives.
Along the years the BIAL Foundation has developed an important relationship with the scientific community, first in Portugal and after worldwide. Today it is an institution of reference which aims to stimulate new researches that may help people, promote more health and contribute to new milestones to gain access to knowledge.
Among its activities the BIAL Foundation manages the BIAL Award, created in 1984, one of the most important awards in the Health field in Europe. The BIAL Award rewards both the basic and the clinical research distinguishing works of major impact in medical research.
The BIAL Foundation also assigns Scientific Research Scholarships for the study of neurophysiological and mental health in people, arousing the interest of researchers in the areas of Psychophysiology and Parapsychology.
To date the BIAL Foundation has supported 461 projects, more than 1000 researchers, with research groups in twenty-seven countries, resulting, until April 2013, in about 600 full papers, out of which 172 published in indexed international journals with an average impact factor of 3.6 and a substantial number of citations (1665).
Since 1996 the BIAL Foundation organizes the Symposia entitled "Behind and Beyond the Brain", a Forum that gathers well renowned neurosciences speakers and the BIAL Foundation Fellows which are spread around the world.
Classified as an institution of public utility, the BIAL Foundation includes among its patrons the Portuguese President, the Portuguese Universities Rectors' Council and the Portuguese Medical Association.
URL: http://www.bial.com/pt/
Accessibility: By permission

Reference code: PT/FB/BL
Entity holding: BIAL Foundation
Title: BIAL Grants
Start date: 1994
History:
In 1994 the BIAL Foundation launched a programme of science research grants with the aim of encouraging the research into Man’s physical and mental processes, namely in fields still largely unexplored but which warrant further scientific analysis, as Psychophysiology and Parapsychology.
Since its launch, applications to the BIAL grants have been increasing. Up to now 461 projects have been supported, involving more than 1000 researchers from 27 countries.
The approved applications have benefited from grants in amounts comprised between €5,000 and €50, 000. The amount to be granted is fixed by the Scientific board according to the needs of each project.
The supported projects have originated, until April 2013, in about 600 full papers, 172 out of which were published in indexed international journals with an average impact factor of 3.6 and a substantial number of citations (1665).
Among the BIAL Foundation fellows is worth highlighting the presence of scientists from prestigious universities from the United States, United Kingdom, Australia, Russia, Germany, Japan, France, Canada, and many others.
The BIAL grants are promoted biannually.

Reference code: PT/FB/BL-2010
Location: Arquivo PCA - Pastas 1 a 23
Title:
2010 Grants
Start date: 2011-01

Reference code: PT/FB/BL-2010-055
Location: Arquivo PCA - Pasta 11/2010
Title:
055 - The developmental and psychophysiological emergence of dreams and nightmares: state-dependent and state-independent fronto-cortical disconnectivity
Duration: 2011-03 - 2014-02
Researcher(s):
Róbert Bódizs, Peter Daniel Simor, Piroska Sándor, Szilvia Csóka, Klára Horváth
Institution(s): Institute of Behavioural Sciences, Semmelweis University, Budapest (Hungary)
Contents: Contents:
Bursary agreement
Application form
Correspondence
Financial report and expenditure documents
Progress report
Final reports
7 Articles ( published or submittedr publication)
5 Conference abstracts
Language: eng
Author:
Bódizs, R.
Secondary author(s):
Simor, P., Sándor, P., Csóka, S., Horváth, K.
Number of reproductions:
1
Keywords:
Psychophysiology / Sleep and Dreams / Biopsychological problems / Mental health / Sleep disorders / Brain structure and function / Developmental psychology

Reference code: PT/FB/BL-2010-055.08
Location: Arquivo PCA - Pasta 10/2010
Title:
REM sleep EEG theta activity is a negative correlate of attachment anxiety
Publication year: 2011
URL:
http://www.frontiersin.org/alerts/pdf/behavioral_neuroscience/EBBS2011_abstracts.pdf
Abstract/Results: ABSTRACT:
INTRODUCTION:
Several behavioural correlates of EEG theta activity were reported previously. Some of these correlates
were shown to be trait-like in nature belonging to the affective domain. Frontal theta activity measured during wakeful resting conditions was found to be a negative correlate of anxiety-related measures mainly. However, knowledge on the trait-like affective correlates of REM sleep theta activity is sparse. Based on the intimate relationship between REM sleep and attachment, as well as on the neurobiology of this sleep state we hypothesize that REM sleep frontal theta activity is negatively correlated with measures of attachment anxiety (AAn). As Heart Rate Variability (HRV) as an indicator of the sympatovagal balance was shown to be related to theta activity, we also hypothesized that REM sleep HRV is related to both theta activity and AAn.
METHODS:
35 subjects (20 men, Mage=31.6 years) slept two consecutive nights in the sleep laboratory. Polysomnography covered EEG, EOG, and ECG. Power spectra of whole second night NREM and REM sleep
EEG as well as spectral HRV measures of the ECG in NREM and REM sleep were calculated. Subjects filled
the Relationship Scales Questionnaire measuring adult attachment along the dimensions of AA and attachment avoidance (AAv). Pearson correlations between log-normalized 0.25 Hz wide EEG power bins and attachment, between log-normalized EEG power and HRV, as well as between HRV and attachment were calculated.
RESULTS:
Significant negative correlations between REM sleep EEG power and AAn were observed at frequencies pertaining to the theta range (4.75-7.5 Hz) in the fronto-central and temporal regions. These correlations were specific to REM sleep as NREM sleep theta EEG power was found to be uncorrelated with AAn. The hypothesized correlations between REM sleep theta EEG power and HRV, or AAn and HRV were not supported by our data. Unpredicted correlations were negative between AAn and REM sleep frontal beta (12.25-20.25 Hz) power, and positive between AAv and NREM sleep alpha/sigma (8-13 Hz) power.
DISCUSSION:
Frontal theta activity and HRV are unrelated, perhaps physiologically uncoupled during REM sleep. REM sleep theta EEG, but not HRV is negatively associated with questionnaire measures of AAn.
Accessibility: Document exists in file
Copyright/Reproduction:
By permission
Language:
eng
Author:
Bódizs, R.
Secondary author(s):
Simor, P., Körmendi, J., Csóka, S., Ujma, P., Sándor, P., Horváth, K., Harmat, L.
Document type:
Abstract book
Number of reproductions:
1
Reference:
Bódizs, R., Simor, P., Körmendi, J., Csóka, S., Ujma, P., Sándor, P., Horváth, K., & Harmat, L. (2011). REM sleep EEG theta activity is a negative correlate of attachment anxiety. In Abstracts of the 43rd European Brain and Behaviour Society Meeting (p. 69). Seville, Spain: EBBS.
Indexed document: No
Keywords: Attachment anxiety / Polysomnography / REM sleep / EEG theta activity

REM sleep EEG theta activity is a negative correlate of attachment anxiety

REM sleep EEG theta activity is a negative correlate of attachment anxiety
DocumentSpectral electroencephalographic sleep alterations in subjects with frequent nightmares2011

Reference code: PT/FB
Entity holding: BIAL Foundation
Location: S. Mamede do Coronado
Title:
BIAL Foundation Archive
Start date: 1994
History:
The BIAL Foundation was created in 1994 by Laboratórios BIAL in conjunction with the Council of Rectors of Portuguese Universities. BIAL’s Foundation mission is to foster the scientific study of Man from both the physical and spiritual perspectives.
Along the years the BIAL Foundation has developed an important relationship with the scientific community, first in Portugal and after worldwide. Today it is an institution of reference which aims to stimulate new researches that may help people, promote more health and contribute to new milestones to gain access to knowledge.
Among its activities the BIAL Foundation manages the BIAL Award, created in 1984, one of the most important awards in the Health field in Europe. The BIAL Award rewards both the basic and the clinical research distinguishing works of major impact in medical research.
The BIAL Foundation also assigns Scientific Research Scholarships for the study of neurophysiological and mental health in people, arousing the interest of researchers in the areas of Psychophysiology and Parapsychology.
To date the BIAL Foundation has supported 461 projects, more than 1000 researchers, with research groups in twenty-seven countries, resulting, until April 2013, in about 600 full papers, out of which 172 published in indexed international journals with an average impact factor of 3.6 and a substantial number of citations (1665).
Since 1996 the BIAL Foundation organizes the Symposia entitled "Behind and Beyond the Brain", a Forum that gathers well renowned neurosciences speakers and the BIAL Foundation Fellows which are spread around the world.
Classified as an institution of public utility, the BIAL Foundation includes among its patrons the Portuguese President, the Portuguese Universities Rectors' Council and the Portuguese Medical Association.
URL: http://www.bial.com/pt/
Accessibility: By permission

Reference code: PT/FB/BL
Entity holding: BIAL Foundation
Title: BIAL Grants
Start date: 1994
History:
In 1994 the BIAL Foundation launched a programme of science research grants with the aim of encouraging the research into Man’s physical and mental processes, namely in fields still largely unexplored but which warrant further scientific analysis, as Psychophysiology and Parapsychology.
Since its launch, applications to the BIAL grants have been increasing. Up to now 461 projects have been supported, involving more than 1000 researchers from 27 countries.
The approved applications have benefited from grants in amounts comprised between €5,000 and €50, 000. The amount to be granted is fixed by the Scientific board according to the needs of each project.
The supported projects have originated, until April 2013, in about 600 full papers, 172 out of which were published in indexed international journals with an average impact factor of 3.6 and a substantial number of citations (1665).
Among the BIAL Foundation fellows is worth highlighting the presence of scientists from prestigious universities from the United States, United Kingdom, Australia, Russia, Germany, Japan, France, Canada, and many others.
The BIAL grants are promoted biannually.

Reference code: PT/FB/BL-2010
Location: Arquivo PCA - Pastas 1 a 23
Title:
2010 Grants
Start date: 2011-01

Reference code: PT/FB/BL-2010-055
Location: Arquivo PCA - Pasta 11/2010
Title:
055 - The developmental and psychophysiological emergence of dreams and nightmares: state-dependent and state-independent fronto-cortical disconnectivity
Duration: 2011-03 - 2014-02
Researcher(s):
Róbert Bódizs, Peter Daniel Simor, Piroska Sándor, Szilvia Csóka, Klára Horváth
Institution(s): Institute of Behavioural Sciences, Semmelweis University, Budapest (Hungary)
Contents: Contents:
Bursary agreement
Application form
Correspondence
Financial report and expenditure documents
Progress report
Final reports
7 Articles ( published or submittedr publication)
5 Conference abstracts
Language: eng
Author:
Bódizs, R.
Secondary author(s):
Simor, P., Sándor, P., Csóka, S., Horváth, K.
Number of reproductions:
1
Keywords:
Psychophysiology / Sleep and Dreams / Biopsychological problems / Mental health / Sleep disorders / Brain structure and function / Developmental psychology

Reference code: PT/FB/BL-2010-055.11
Location: Arquivo PCA - Pasta 10/2010
Title:
Spectral electroencephalographic sleep alterations in subjects with frequent nightmares
Publication year: 2011
URL:
http://onlinelibrary.wiley.com/doi/10.1111/j.1365-2869.2012.01044.x/pdf
Abstract/Results: ABSTRACT:
OBJECTIVES:
Idiopathic nightmare disorder, which affects 2–8% of the population, is a distinct diagnostic category in the International Classification of Sleep Disorders (2nd edition) and the Diagnostic and Statistical Manual of Mental Disorders as well. However, the characteristic sleep profile of nightmare subjects (NMs) has rather
been under-researched. Our goal is to obtain a comprehensive picture of the sleep of NMs by means of spectral electroencephalographic (EEG) analyses which can provide valuable insights into the underlying pathophysiology.
METHODS:
Thirty-five university students without any prior history of mental or chronic somatic disease (17 NMs and 18 controls) went through standard two-night polysomnographic examination (with 19 EEG channels) in our sleep laboratory. Psychometric testing was also conducted including the State-Trait Anxiety Inventory (STAI) and the Beck Depression Inventory (BDI). EEG spectra were obtained by using Fast-Fourier Transformation of the second night recordings for rapid-eye movement (REM) and non-rapid eye-movement (NREM) sleep separately. We also computed the spectra of the first 4 sleep cycles distinctly in order to understand better sleep dynamics. To control the individual differences in the amplitude of power spectral
density, relative EEG spectra were calculated for 6 frequency bands (delta, theta, alpha, sigma, beta, gamma).
RESULTS:
Regarding all night data we compared the two groups by covariance analysis with STAI and BDI as covariates. The nightmare group was characterised by marginally (P < 0.10) lower frontal delta (1.25–4 Hz), as well as significantly (P < 0.05) higher fronto-central theta (4.25–7.5 Hz) and alpha (7.75–10.25 Hz) NREM activity compared to controls. The separate analysis of sleep cycles revealed that the reduced delta activity is characteristic for the 1st, while the increased theta for the 1st and the 4th sleep periods in NMs. Higher alpha activity was found mainly in the 4th sleep cycle.
CONCLUSIONS:
Our results provide evidence that NMs, even if they did not experience negative dreams, differ from controls in their sleep EEG spectra, mostly regarding NREM sleep. Lower delta activity indicates disrupted sleep which may be associated with impaired executive functions in NMs, whereas higher alpha activity in the 4th sleep cycle may be the sign of hyperarousal later in the night. Moreover, the covert REM sleep phenomena might explain the higher theta activity in NMs.
Accessibility: Document exists in file
Copyright/Reproduction:
By permission
Language:
eng
Author:
Horváth, K.
Secondary author(s):
Simor, P., Gombos, F., Bódizs, R.
Document type:
Abstract
Number of reproductions:
1
Reference:
Horváth, K., Simor, P., Gombos, F., & Bódizs, R. (2012). Spectral electroencephalographic sleep alterations in subjects with frequent nightmares. Journal of Sleep Research, 21(Suppl. 1), 362. https://doi.org/10.1111/j.1365-2869.2012.01044.x
Indexed document: Yes
Keywords: Idiopathic nightmare disorder / Polysomnography / Anxiety / Depression / Covert REM sleep

Spectral electroencephalographic sleep alterations in subjects with frequent nightmares

Spectral electroencephalographic sleep alterations in subjects with frequent nightmares
DocumentSleep macrostructure is modulated by positive and negative social experience in adult pet dogs2017

Reference code: PT/FB
Entity holding: BIAL Foundation
Location: S. Mamede do Coronado
Title:
BIAL Foundation Archive
Start date: 1994
History:
The BIAL Foundation was created in 1994 by Laboratórios BIAL in conjunction with the Council of Rectors of Portuguese Universities. BIAL’s Foundation mission is to foster the scientific study of Man from both the physical and spiritual perspectives.
Along the years the BIAL Foundation has developed an important relationship with the scientific community, first in Portugal and after worldwide. Today it is an institution of reference which aims to stimulate new researches that may help people, promote more health and contribute to new milestones to gain access to knowledge.
Among its activities the BIAL Foundation manages the BIAL Award, created in 1984, one of the most important awards in the Health field in Europe. The BIAL Award rewards both the basic and the clinical research distinguishing works of major impact in medical research.
The BIAL Foundation also assigns Scientific Research Scholarships for the study of neurophysiological and mental health in people, arousing the interest of researchers in the areas of Psychophysiology and Parapsychology.
To date the BIAL Foundation has supported 461 projects, more than 1000 researchers, with research groups in twenty-seven countries, resulting, until April 2013, in about 600 full papers, out of which 172 published in indexed international journals with an average impact factor of 3.6 and a substantial number of citations (1665).
Since 1996 the BIAL Foundation organizes the Symposia entitled "Behind and Beyond the Brain", a Forum that gathers well renowned neurosciences speakers and the BIAL Foundation Fellows which are spread around the world.
Classified as an institution of public utility, the BIAL Foundation includes among its patrons the Portuguese President, the Portuguese Universities Rectors' Council and the Portuguese Medical Association.
URL: http://www.bial.com/pt/
Accessibility: By permission

Reference code: PT/FB/BL
Entity holding: BIAL Foundation
Title: BIAL Grants
Start date: 1994
History:
In 1994 the BIAL Foundation launched a programme of science research grants with the aim of encouraging the research into Man’s physical and mental processes, namely in fields still largely unexplored but which warrant further scientific analysis, as Psychophysiology and Parapsychology.
Since its launch, applications to the BIAL grants have been increasing. Up to now 461 projects have been supported, involving more than 1000 researchers from 27 countries.
The approved applications have benefited from grants in amounts comprised between €5,000 and €50, 000. The amount to be granted is fixed by the Scientific board according to the needs of each project.
The supported projects have originated, until April 2013, in about 600 full papers, 172 out of which were published in indexed international journals with an average impact factor of 3.6 and a substantial number of citations (1665).
Among the BIAL Foundation fellows is worth highlighting the presence of scientists from prestigious universities from the United States, United Kingdom, Australia, Russia, Germany, Japan, France, Canada, and many others.
The BIAL grants are promoted biannually.

Reference code: PT/FB/BL-2016
Location: BF-GMS
Title:
2016 Grants
Start date: 2017-01

Reference code: PT/FB/BL-2016-169
Location: BF-GMS
Title:
169 - The potential effect of behavioral stimulation on social competence in dogs (via endogenous oxytocin release)
Duration: 2017-01 - 2021-11
Researcher(s):
Anna Kis, József Topál, Alin Ciobica, Radu Lefter, Katinka Tóth
Institution(s): Institute of Cognitive Neuroscience and Psychology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest (Hungary); Department of Animal Physiology and Behaviour "Alexandru Ioan Cuza" University, Iasi (Romania)
Contents: Contents:
Application form
Correspondence
Research Funding Agreement
Progress Report
Final Report
Articles
Author: Kis, A.
Secondary author(s):
Topál, J., Ciobica, A., Lefter, R., Tóth, K.
Number of reproductions:
1
Keywords:
Dog (Canis familiaris) / Social stimutation / Oxytocin / Social cognition / Psychophysiology

Reference code: PT/FB/BL-2016-169.03
Location: BF-GMS
Title:
Sleep macrostructure is modulated by positive and negative social experience in adult pet dogs
Publication year: 2017
URL:
http://rspb.royalsocietypublishing.org/content/284/1865/20171883.long
Abstract/Results: ABSTRACT:
The effects of emotionally valenced events on sleep physiology are well studied in humans and laboratory rodents. However, little is known about these effects in other species, despite the fact that several sleep characteristics differ across species and thus limit the generalizability of such findings. Here we studied the effect of positive and negative social experiences on sleep macrostructure in dogs, a species proven to be a good model of human social cognition. A non-invasive polysomnography method was used to collect data from pet dogs (n = 16) participating in 3-hour-long sleep occasions. Before sleep, dogs were exposed to emotionally positive or negative social interactions (PSI or NSI) in a within-subject design. PSI consisted of petting and ball play, while NSI was a mixture of separation, threatening approach and still face test. Sleep macrostructure was markedly different between pre-treatment conditions, with a shorter sleep latency after NSI and a redistribution of the time spent in the different sleep stages. Dogs' behaviour during pre-treatments was related to the macrostructural difference between the two occasions, and was further modulated by individual variability in personality. This result provides the first direct evidence that emotional stimuli affect subsequent sleep physiology in dogs.
Accessibility: Document exists in file
Copyright/Reproduction:
By permission
Language:
eng
Author:
Kis, A.
Secondary author(s):
Gergely, A., Galambos, Á., Abdai, J., Gombos, F., Bódizs, R., Topál, J.
Document type:
Article
Number of reproductions:
1
Reference:
Kis, A., Gergely, A., Galambos, Á., Abdai, J., Gombos, F., Bódizs, R., & Topál, J. (2017). Sleep macrostructure is modulated by positive and negative social experience in adult pet dogs. Proceedings of the Royal Society B, 284(1865). https://doi.org/10.1098/rspb.2017.1883
2-year Impact Factor: 4.847|2017
Times cited: N/A
Indexed document: Yes
Quartile: Q1
Keywords: REM sleep / Dog / Polysomnography / Stress
DocumentSleep stage transition dynamics reveal specific stage 2 vulnerability in insomnia2017

Reference code: PT/FB
Entity holding: BIAL Foundation
Location: S. Mamede do Coronado
Title:
BIAL Foundation Archive
Start date: 1994
History:
The BIAL Foundation was created in 1994 by Laboratórios BIAL in conjunction with the Council of Rectors of Portuguese Universities. BIAL’s Foundation mission is to foster the scientific study of Man from both the physical and spiritual perspectives.
Along the years the BIAL Foundation has developed an important relationship with the scientific community, first in Portugal and after worldwide. Today it is an institution of reference which aims to stimulate new researches that may help people, promote more health and contribute to new milestones to gain access to knowledge.
Among its activities the BIAL Foundation manages the BIAL Award, created in 1984, one of the most important awards in the Health field in Europe. The BIAL Award rewards both the basic and the clinical research distinguishing works of major impact in medical research.
The BIAL Foundation also assigns Scientific Research Scholarships for the study of neurophysiological and mental health in people, arousing the interest of researchers in the areas of Psychophysiology and Parapsychology.
To date the BIAL Foundation has supported 461 projects, more than 1000 researchers, with research groups in twenty-seven countries, resulting, until April 2013, in about 600 full papers, out of which 172 published in indexed international journals with an average impact factor of 3.6 and a substantial number of citations (1665).
Since 1996 the BIAL Foundation organizes the Symposia entitled "Behind and Beyond the Brain", a Forum that gathers well renowned neurosciences speakers and the BIAL Foundation Fellows which are spread around the world.
Classified as an institution of public utility, the BIAL Foundation includes among its patrons the Portuguese President, the Portuguese Universities Rectors' Council and the Portuguese Medical Association.
URL: http://www.bial.com/pt/
Accessibility: By permission

Reference code: PT/FB/BL
Entity holding: BIAL Foundation
Title: BIAL Grants
Start date: 1994
History:
In 1994 the BIAL Foundation launched a programme of science research grants with the aim of encouraging the research into Man’s physical and mental processes, namely in fields still largely unexplored but which warrant further scientific analysis, as Psychophysiology and Parapsychology.
Since its launch, applications to the BIAL grants have been increasing. Up to now 461 projects have been supported, involving more than 1000 researchers from 27 countries.
The approved applications have benefited from grants in amounts comprised between €5,000 and €50, 000. The amount to be granted is fixed by the Scientific board according to the needs of each project.
The supported projects have originated, until April 2013, in about 600 full papers, 172 out of which were published in indexed international journals with an average impact factor of 3.6 and a substantial number of citations (1665).
Among the BIAL Foundation fellows is worth highlighting the presence of scientists from prestigious universities from the United States, United Kingdom, Australia, Russia, Germany, Japan, France, Canada, and many others.
The BIAL grants are promoted biannually.

Reference code: PT/FB/BL-2012
Location: SEC PCA
Title:
2012 Grants
Start date: 2013-02

Reference code: PT/FB/BL-2012-252
Location: SEC PCA 252/12
Title:
252 - Sleep state misperception mispercieved
Duration: 2014-06 - 2017-01
Researcher(s):
Eus J. W. Van Someren, J. Ramautar
Institution(s): Netherlands Institute for Neuroscience, Dept. Sleep & Cognition, Amsterdam (The Netherlands)
Contents: Contents:
Application form
Correspondence
Progress reports
Final reports
2 Articles
Language: eng
Author:
Van Someren, E.
Secondary author(s):
Ramautar, J.
Number of reproductions:
1
Keywords:
Psychophysiology / Sleep and dreams / Biopsychological problems / Mental health / Sleep disorders / Brain structure and function / Cognitive processes / Memory / Consciousness

Reference code: PT/FB/BL-2012-252.05
Location: SEC PCA 252/12
Title:
Sleep stage transition dynamics reveal specific stage 2 vulnerability in insomnia
Publication year: 2017
URL:
https://academic.oup.com/sleep/article-abstract/40/9/zsx117/3926054?redirectedFrom=fulltext
Abstract/Results: ABSTRACT:
STUDY OBJECTIVES:
Objective sleep impairments in insomnia disorder (ID) are insufficiently understood. The present study evaluated whether whole-night sleep stage dynamics derived from polysomnography (PSG) differ between people with ID and matched controls and whether sleep stage dynamic features discriminate them better than conventional sleep parameters.
METHODS:
Eighty-eight participants aged 21-70 years, including 46 with ID and 42 age- and sex-matched controls without sleep complaints, were recruited through www.sleepregistry.nl and completed two nights of laboratory PSG. Data of 100 people with ID and 100 age- and sex-matched controls from a previously reported study were used to validate the generalizability of findings. The second night was used to obtain, in addition to conventional sleep parameters, probabilities of transitions between stages and bout duration distributions of each stage. Group differences were evaluated with nonparametric tests.
RESULTS:
People with ID showed higher empirical probabilities to transition from stage N2 to the lighter sleep stage N1 or wakefulness and a faster decaying stage N2 bout survival function. The increased transition probability from stage N2 to stage N1 discriminated people with ID better than any of their deviations in conventional sleep parameters, including less total sleep time, less sleep efficiency, more stage N1, and more wake after sleep onset. Moreover, adding this transition probability significantly improved the discriminating power of a multiple logistic regression model based on conventional sleep parameters.
CONCLUSIONS:
Quantification of sleep stage dynamics revealed a particular vulnerability of stage N2 in insomnia. The feature characterizes insomnia better than-and independently of-any conventional sleep parameter.
Accessibility: Document does not exist in file
Language:
eng
Author:
Wei, Y.
Secondary author(s):
Colombo, M., Ramautar, J., Blanken, T. F., Van Der Werf, Y. D., Spiegelhalder, K., Feige, B., Riemann, D., Van Someren, E.
Document type:
Article
Number of reproductions:
1
Reference:
Wei, Y., Colombo, M. A., Ramautar, J. R., Blanken, T. F., van der Werf, Y. D., ..., Van Someren, E. (2017). Sleep stage transition dynamics reveal specific stage 2 vulnerability in insomnia. Sleep, 40(9), zsx117. https://doi.org/10.1093/sleep/zsx117
2-year Impact Factor: 5.135|2017
Times cited: 62|2025-09-16
Indexed document: Yes
Quartile: Q1
Keywords: Markov chain / Binary classification / Feature selection / Hypnogram / Insomnia disorder / non-REM sleep / Polysomnography / Sleep architecture / Sleep fragmentation / Sleep stage
DocumentData-driven analysis of EEG reveals concomitant superficial sleep during deep sleep in insomnia disorder2019

Reference code: PT/FB
Entity holding: BIAL Foundation
Location: S. Mamede do Coronado
Title:
BIAL Foundation Archive
Start date: 1994
History:
The BIAL Foundation was created in 1994 by Laboratórios BIAL in conjunction with the Council of Rectors of Portuguese Universities. BIAL’s Foundation mission is to foster the scientific study of Man from both the physical and spiritual perspectives.
Along the years the BIAL Foundation has developed an important relationship with the scientific community, first in Portugal and after worldwide. Today it is an institution of reference which aims to stimulate new researches that may help people, promote more health and contribute to new milestones to gain access to knowledge.
Among its activities the BIAL Foundation manages the BIAL Award, created in 1984, one of the most important awards in the Health field in Europe. The BIAL Award rewards both the basic and the clinical research distinguishing works of major impact in medical research.
The BIAL Foundation also assigns Scientific Research Scholarships for the study of neurophysiological and mental health in people, arousing the interest of researchers in the areas of Psychophysiology and Parapsychology.
To date the BIAL Foundation has supported 461 projects, more than 1000 researchers, with research groups in twenty-seven countries, resulting, until April 2013, in about 600 full papers, out of which 172 published in indexed international journals with an average impact factor of 3.6 and a substantial number of citations (1665).
Since 1996 the BIAL Foundation organizes the Symposia entitled "Behind and Beyond the Brain", a Forum that gathers well renowned neurosciences speakers and the BIAL Foundation Fellows which are spread around the world.
Classified as an institution of public utility, the BIAL Foundation includes among its patrons the Portuguese President, the Portuguese Universities Rectors' Council and the Portuguese Medical Association.
URL: http://www.bial.com/pt/
Accessibility: By permission

Reference code: PT/FB/BL
Entity holding: BIAL Foundation
Title: BIAL Grants
Start date: 1994
History:
In 1994 the BIAL Foundation launched a programme of science research grants with the aim of encouraging the research into Man’s physical and mental processes, namely in fields still largely unexplored but which warrant further scientific analysis, as Psychophysiology and Parapsychology.
Since its launch, applications to the BIAL grants have been increasing. Up to now 461 projects have been supported, involving more than 1000 researchers from 27 countries.
The approved applications have benefited from grants in amounts comprised between €5,000 and €50, 000. The amount to be granted is fixed by the Scientific board according to the needs of each project.
The supported projects have originated, until April 2013, in about 600 full papers, 172 out of which were published in indexed international journals with an average impact factor of 3.6 and a substantial number of citations (1665).
Among the BIAL Foundation fellows is worth highlighting the presence of scientists from prestigious universities from the United States, United Kingdom, Australia, Russia, Germany, Japan, France, Canada, and many others.
The BIAL grants are promoted biannually.

Reference code: PT/FB/BL-2016
Location: BF-GMS
Title:
2016 Grants
Start date: 2017-01

Reference code: PT/FB/BL-2016-190
Location: BF-GMS
Title:
190 - Sleeping body, sentient mind? Searching for the neural bases of conscious experiences during sleep
Duration: 2017-10 - 2019-06
Researcher(s):
Eus Van Someren, Yishul Wei
Institution(s): Department of Sleep and Cognition, Netherlands Institute for Neuroscience, Amsterdam (The Netherlands)
Contents: Contents:
Application form
Correspondence
Progress report
Final report
Articles
Author: Van Someren, E.
Secondary author(s):
Wei, Y.
Number of reproductions:
1
Keywords:
Interoception / Insomnia / Neural correlates of consciousness / Salience / Psychophysiology

Reference code: PT/FB/BL-2016-190.08
Location: BF-GMS
Title:
Data-driven analysis of EEG reveals concomitant superficial sleep during deep sleep in insomnia disorder
Publication year: 2019
URL:
https://www.frontiersin.org/articles/10.3389/fnins.2019.00598/full
Abstract/Results: ABSTRACT:
Study Objectives: The subjective suffering of people with Insomnia Disorder (ID) is insufficiently accounted for by traditional sleep classification, which presumes a strict sequential occurrence of global brain states. Recent studies challenged this presumption by showing concurrent sleep-and wake-type neuronal activity. We hypothesized enhanced co-occurrence of diverging EEG vigilance signatures during sleep in ID.
Methods: Electroencephalography (EEG) in 55 cases with ID and 64 controls without sleep complaints was subjected to a Latent Dirichlet Allocation topic model describing each 30 s epoch as a mixture of six vigilance states called Topics (T), ranked from N3-related T1 and T2 to wakefulness-related T6. For each stable epoch we determined topic dominance (the probability of the most likely topic), topic co-occurrence (the probability of the remaining topics), and epoch-to-epoch transition probabilities.
Results: In stable epochs where the N1-related T4 was dominant, T4 was more dominant in ID than in controls, and patients showed an almost doubled co-occurrence of T4 during epochs where the N3-related T1 was dominant. Furthermore, patients had a higher probability of switching from T1- to T4-dominated epochs, at the cost of switching to N3-related T2-dominated epochs, and a higher probability of switching from N2-related T3- to wakefulness-related T6-dominated epochs.
Conclusion: Even during their deepest sleep, the EEG of people with ID express more N1-related vigilance signatures than good sleepers do. People with ID are moreover more likely to switch from deep to light sleep and from N2 sleep to wakefulness. The findings suggest that hyperarousal never rests in ID.
Accessibility: Document exists in file
Language:
eng
Related objects:
BL-2012-252.07
Author: Christensen, J. A. E.
Secondary author(s):
Wassing, R., Wei, Y., Ramautar, J. R., Lakbila-Kamal, O., Jennum, P. J., Van Someren, E. J. W.
Document type:
Article
Number of reproductions:
1
Reference:
Christensen, J. A. E., Wassing, R., Wei, Y., Ramautar, J. R., Lakbila-Kamal, O., Jennum, P. J., & Van Someren, E. J. W. (2019). Data-driven analysis of EEG reveals concomitant superficial sleep during deep sleep in insomnia disorder. Frontiers in Neuroscience, 13: 598. https://doi.org/10.3389/fnins.2019.00598
2-year Impact Factor: 3.707|2019
Times cited: 25|2025-09-17
Indexed document: Yes
Quartile: Q2
Keywords: Insomnia / Indiscrete labeling of sleep / Vigilance states / Topic modeling / Data-driven analysis / Polysomnography / Latent Dirichlet allocation

Data-driven analysis of EEG reveals concomitant superficial sleep during deep sleep in insomnia disorder

Data-driven analysis of EEG reveals concomitant superficial sleep during deep sleep in insomnia disorder
DocumentData-driven analysis of EEG reveals concomitant superficial sleep during deep sleep in insomnia disorder2019

Reference code: PT/FB
Entity holding: BIAL Foundation
Location: S. Mamede do Coronado
Title:
BIAL Foundation Archive
Start date: 1994
History:
The BIAL Foundation was created in 1994 by Laboratórios BIAL in conjunction with the Council of Rectors of Portuguese Universities. BIAL’s Foundation mission is to foster the scientific study of Man from both the physical and spiritual perspectives.
Along the years the BIAL Foundation has developed an important relationship with the scientific community, first in Portugal and after worldwide. Today it is an institution of reference which aims to stimulate new researches that may help people, promote more health and contribute to new milestones to gain access to knowledge.
Among its activities the BIAL Foundation manages the BIAL Award, created in 1984, one of the most important awards in the Health field in Europe. The BIAL Award rewards both the basic and the clinical research distinguishing works of major impact in medical research.
The BIAL Foundation also assigns Scientific Research Scholarships for the study of neurophysiological and mental health in people, arousing the interest of researchers in the areas of Psychophysiology and Parapsychology.
To date the BIAL Foundation has supported 461 projects, more than 1000 researchers, with research groups in twenty-seven countries, resulting, until April 2013, in about 600 full papers, out of which 172 published in indexed international journals with an average impact factor of 3.6 and a substantial number of citations (1665).
Since 1996 the BIAL Foundation organizes the Symposia entitled "Behind and Beyond the Brain", a Forum that gathers well renowned neurosciences speakers and the BIAL Foundation Fellows which are spread around the world.
Classified as an institution of public utility, the BIAL Foundation includes among its patrons the Portuguese President, the Portuguese Universities Rectors' Council and the Portuguese Medical Association.
URL: http://www.bial.com/pt/
Accessibility: By permission

Reference code: PT/FB/BL
Entity holding: BIAL Foundation
Title: BIAL Grants
Start date: 1994
History:
In 1994 the BIAL Foundation launched a programme of science research grants with the aim of encouraging the research into Man’s physical and mental processes, namely in fields still largely unexplored but which warrant further scientific analysis, as Psychophysiology and Parapsychology.
Since its launch, applications to the BIAL grants have been increasing. Up to now 461 projects have been supported, involving more than 1000 researchers from 27 countries.
The approved applications have benefited from grants in amounts comprised between €5,000 and €50, 000. The amount to be granted is fixed by the Scientific board according to the needs of each project.
The supported projects have originated, until April 2013, in about 600 full papers, 172 out of which were published in indexed international journals with an average impact factor of 3.6 and a substantial number of citations (1665).
Among the BIAL Foundation fellows is worth highlighting the presence of scientists from prestigious universities from the United States, United Kingdom, Australia, Russia, Germany, Japan, France, Canada, and many others.
The BIAL grants are promoted biannually.

Reference code: PT/FB/BL-2012
Location: SEC PCA
Title:
2012 Grants
Start date: 2013-02

Reference code: PT/FB/BL-2012-252
Location: SEC PCA 252/12
Title:
252 - Sleep state misperception mispercieved
Duration: 2014-06 - 2017-01
Researcher(s):
Eus J. W. Van Someren, J. Ramautar
Institution(s): Netherlands Institute for Neuroscience, Dept. Sleep & Cognition, Amsterdam (The Netherlands)
Contents: Contents:
Application form
Correspondence
Progress reports
Final reports
2 Articles
Language: eng
Author:
Van Someren, E.
Secondary author(s):
Ramautar, J.
Number of reproductions:
1
Keywords:
Psychophysiology / Sleep and dreams / Biopsychological problems / Mental health / Sleep disorders / Brain structure and function / Cognitive processes / Memory / Consciousness

Reference code: PT/FB/BL-2012-252.07
Location: SEC PCA 252/12
Title:
Data-driven analysis of EEG reveals concomitant superficial sleep during deep sleep in insomnia disorder
Publication year: 2019
URL:
https://www.frontiersin.org/articles/10.3389/fnins.2019.00598/full
Abstract/Results: ABSTRACT:
Study Objectives: The subjective suffering of people with Insomnia Disorder (ID) is insufficiently accounted for by traditional sleep classification, which presumes a strict sequential occurrence of global brain states. Recent studies challenged this presumption by showing concurrent sleep- and wake-type neuronal activity. We hypothesized enhanced co-occurrence of diverging EEG vigilance signatures during sleep in ID.
Methods: Electroencephalography (EEG) in 55 cases with ID and 64 controls without sleep complaints was subjected to a Latent Dirichlet Allocation topic model describing each 30 s epoch as a mixture of six vigilance states called Topics (T), ranked from N3-related T1 and T2 to wakefulness-related T6. For each stable epoch we determined topic dominance (the probability of the most likely topic), topic co-occurrence (the probability of the remaining topics), and epoch-to-epoch transition probabilities.
Results: In stable epochs where the N1-related T4 was dominant, T4 was more dominant in ID than in controls, and patients showed an almost doubled co-occurrence of T4 during epochs where the N3-related T1 was dominant. Furthermore, patients had a higher probability of switching from T1- to T4-dominated epochs, at the cost of switching to N3-related T2-dominated epochs, and a higher probability of switching from N2-related T3- to wakefulness-related T6-dominated epochs.
Conclusion: Even during their deepest sleep, the EEG of people with ID express more N1-related vigilance signatures than good sleepers do. People with ID are moreover more likely to switch from deep to light sleep and from N2 sleep to wakefulness. The findings suggest that hyperarousal never rests in ID.
Accessibility: Document exists in file
Language:
eng
Related objects:
BL-2016-190.08
Author: Christensen, J. A. E.
Secondary author(s):
Wassing, R., Wei, Y., Ramautar, J. R., Lakbila-Kamal, O., Jennum, P. J., Van Someren, E. J. W.
Document type:
Article-d
Number of reproductions:
1
Reference:
Christensen, J. A. E., Wassing, R., Wei, Y., Ramautar, J. R., Lakbila-Kamal, O., Jennum, P. J., & Van Someren, E. J. W. (2019). Data-driven analysis of EEG reveals concomitant superficial sleep during deep sleep in insomnia disorder. Frontiers in Neuroscience, 13: 598. https://doi.org/10.3389/fnins.2019.00598
2-year Impact Factor: 3.707|2019
Times cited: 25|2025-09-17
Indexed document: Yes
Quartile: Q2
Keywords: Insomnia / Indiscrete labeling of sleep / Vigilance states / Topic modeling / Data-driven analysis / Polysomnography / Latent Dirichlet allocation

Data-driven analysis of EEG reveals concomitant superficial sleep during deep sleep in insomnia disorder

Data-driven analysis of EEG reveals concomitant superficial sleep during deep sleep in insomnia disorder
DocumentData-driven analysis of EEG reveals concomitant superficial sleep during deep sleep in insomnia disorder2019

Reference code: PT/FB
Entity holding: BIAL Foundation
Location: S. Mamede do Coronado
Title:
BIAL Foundation Archive
Start date: 1994
History:
The BIAL Foundation was created in 1994 by Laboratórios BIAL in conjunction with the Council of Rectors of Portuguese Universities. BIAL’s Foundation mission is to foster the scientific study of Man from both the physical and spiritual perspectives.
Along the years the BIAL Foundation has developed an important relationship with the scientific community, first in Portugal and after worldwide. Today it is an institution of reference which aims to stimulate new researches that may help people, promote more health and contribute to new milestones to gain access to knowledge.
Among its activities the BIAL Foundation manages the BIAL Award, created in 1984, one of the most important awards in the Health field in Europe. The BIAL Award rewards both the basic and the clinical research distinguishing works of major impact in medical research.
The BIAL Foundation also assigns Scientific Research Scholarships for the study of neurophysiological and mental health in people, arousing the interest of researchers in the areas of Psychophysiology and Parapsychology.
To date the BIAL Foundation has supported 461 projects, more than 1000 researchers, with research groups in twenty-seven countries, resulting, until April 2013, in about 600 full papers, out of which 172 published in indexed international journals with an average impact factor of 3.6 and a substantial number of citations (1665).
Since 1996 the BIAL Foundation organizes the Symposia entitled "Behind and Beyond the Brain", a Forum that gathers well renowned neurosciences speakers and the BIAL Foundation Fellows which are spread around the world.
Classified as an institution of public utility, the BIAL Foundation includes among its patrons the Portuguese President, the Portuguese Universities Rectors' Council and the Portuguese Medical Association.
URL: http://www.bial.com/pt/
Accessibility: By permission

Reference code: PT/FB/BL
Entity holding: BIAL Foundation
Title: BIAL Grants
Start date: 1994
History:
In 1994 the BIAL Foundation launched a programme of science research grants with the aim of encouraging the research into Man’s physical and mental processes, namely in fields still largely unexplored but which warrant further scientific analysis, as Psychophysiology and Parapsychology.
Since its launch, applications to the BIAL grants have been increasing. Up to now 461 projects have been supported, involving more than 1000 researchers from 27 countries.
The approved applications have benefited from grants in amounts comprised between €5,000 and €50, 000. The amount to be granted is fixed by the Scientific board according to the needs of each project.
The supported projects have originated, until April 2013, in about 600 full papers, 172 out of which were published in indexed international journals with an average impact factor of 3.6 and a substantial number of citations (1665).
Among the BIAL Foundation fellows is worth highlighting the presence of scientists from prestigious universities from the United States, United Kingdom, Australia, Russia, Germany, Japan, France, Canada, and many others.
The BIAL grants are promoted biannually.

Reference code: PT/FB/BL-2012
Location: SEC PCA
Title:
2012 Grants
Start date: 2013-02

Reference code: PT/FB/BL-2012-253
Location: Arquivo PCA - Pasta 25/2012
Title:
253 - REM-sleep, the regulation of self-conscious emotion and hyperarousal in psychophysiological insomnia
Duration: 2015-11 - 2017-09
Researcher(s):
Lucia Talamini, Ekaterini Georgopoulou, Eus Van Someren
Institution(s): University of Amsterdam, Psychology, Dept. Brain and Cognition (The Netherlands) and Netherlands Institute for Neuroscience, Dept. Sleep & Cognition, Amsterdam (The Netherlands)
Contents: Contents:
Bursary agreement
Application form
Correspondence
Progress report
Final report
Language: eng
Author:
Talamini, L.
Secondary author(s):
Georgopoulou, E., Van Someren, E.
Number of reproductions:
1
Keywords:
Psychophysiology / Psychophysiological insomnia / Hyperarousal / Self-conscious emotion / REM-sleep

Reference code: PT/FB/BL-2012-253.12
Location: BF-GMS
Title:
Data-driven analysis of EEG reveals concomitant superficial sleep during deep sleep in insomnia disorder
Publication year: 2019
URL:
https://www.frontiersin.org/articles/10.3389/fnins.2019.00598/full
Abstract/Results: ABSTRACT:
Study Objectives: The subjective suffering of people with Insomnia Disorder (ID) is insufficiently accounted for by traditional sleep classification, which presumes a strict sequential occurrence of global brain states. Recent studies challenged this presumption by showing concurrent sleep- and wake-type neuronal activity. We hypothesized enhanced co-occurrence of diverging EEG vigilance signatures during sleep in ID.
Methods: Electroencephalography (EEG) in 55 cases with ID and 64 controls without sleep complaints was subjected to a Latent Dirichlet Allocation topic model describing each 30 s epoch as a mixture of six vigilance states called Topics (T), ranked from N3-related T1 and T2 to wakefulness-related T6. For each stable epoch we determined topic dominance (the probability of the most likely topic), topic co-occurrence (the probability of the remaining topics), and epoch-to-epoch transition probabilities.
Results: In stable epochs where the N1-related T4 was dominant, T4 was more dominant in ID than in controls, and patients showed an almost doubled co-occurrence of T4 during epochs where the N3-related T1 was dominant. Furthermore, patients had a higher probability of switching from T1- to T4-dominated epochs, at the cost of switching to N3-related T2-dominated epochs, and a higher probability of switching from N2-related T3- to wakefulness-related T6-dominated epochs.
Conclusion: Even during their deepest sleep, the EEG of people with ID express more N1-related vigilance signatures than good sleepers do. People with ID are moreover more likely to switch from deep to light sleep and from N2 sleep to wakefulness. The findings suggest that hyperarousal never rests in ID.
Accessibility: Document exists in file
Language:
eng
Author:
Christensen, J. A. E.
Secondary author(s):
Wassing, R., Wei, Y., Ramautar, J. R., Lakbila-Kamal, O., Jennum, P. J., Van Someren, E. J. W.
Document type:
Article-d
Number of reproductions:
1
Reference:
Christensen, J. A. E., Wassing, R., Wei, Y., Ramautar, J. R., Lakbila-Kamal, O., Jennum, P. J., & Van Someren, E. J. W. (2019). Data-driven analysis of EEG reveals concomitant superficial sleep during deep sleep in insomnia disorder. Frontiers in Neuroscience, 13: 598. https://doi.org/10.3389/fnins.2019.00598
2-year Impact Factor: N/A
Times cited: 25|2025-09-17
Indexed document: Yes
Quartile: N/A
Keywords: Insomnia / Indiscrete labeling of sleep / Vigilance states / Topic modeling / Data-driven analysis / Polysomnography / Latent Dirichlet allocation

Data-driven analysis of EEG reveals concomitant superficial sleep during deep sleep in insomnia disorder

Data-driven analysis of EEG reveals concomitant superficial sleep during deep sleep in insomnia disorder
DocumentThe multidimensionality of sleep in population-based samples: A narrative review2022

Reference code: PT/FB
Entity holding: BIAL Foundation
Location: S. Mamede do Coronado
Title:
BIAL Foundation Archive
Start date: 1994
History:
The BIAL Foundation was created in 1994 by Laboratórios BIAL in conjunction with the Council of Rectors of Portuguese Universities. BIAL’s Foundation mission is to foster the scientific study of Man from both the physical and spiritual perspectives.
Along the years the BIAL Foundation has developed an important relationship with the scientific community, first in Portugal and after worldwide. Today it is an institution of reference which aims to stimulate new researches that may help people, promote more health and contribute to new milestones to gain access to knowledge.
Among its activities the BIAL Foundation manages the BIAL Award, created in 1984, one of the most important awards in the Health field in Europe. The BIAL Award rewards both the basic and the clinical research distinguishing works of major impact in medical research.
The BIAL Foundation also assigns Scientific Research Scholarships for the study of neurophysiological and mental health in people, arousing the interest of researchers in the areas of Psychophysiology and Parapsychology.
To date the BIAL Foundation has supported 461 projects, more than 1000 researchers, with research groups in twenty-seven countries, resulting, until April 2013, in about 600 full papers, out of which 172 published in indexed international journals with an average impact factor of 3.6 and a substantial number of citations (1665).
Since 1996 the BIAL Foundation organizes the Symposia entitled "Behind and Beyond the Brain", a Forum that gathers well renowned neurosciences speakers and the BIAL Foundation Fellows which are spread around the world.
Classified as an institution of public utility, the BIAL Foundation includes among its patrons the Portuguese President, the Portuguese Universities Rectors' Council and the Portuguese Medical Association.
URL: http://www.bial.com/pt/
Accessibility: By permission

Reference code: PT/FB/BL
Entity holding: BIAL Foundation
Title: BIAL Grants
Start date: 1994
History:
In 1994 the BIAL Foundation launched a programme of science research grants with the aim of encouraging the research into Man’s physical and mental processes, namely in fields still largely unexplored but which warrant further scientific analysis, as Psychophysiology and Parapsychology.
Since its launch, applications to the BIAL grants have been increasing. Up to now 461 projects have been supported, involving more than 1000 researchers from 27 countries.
The approved applications have benefited from grants in amounts comprised between €5,000 and €50, 000. The amount to be granted is fixed by the Scientific board according to the needs of each project.
The supported projects have originated, until April 2013, in about 600 full papers, 172 out of which were published in indexed international journals with an average impact factor of 3.6 and a substantial number of citations (1665).
Among the BIAL Foundation fellows is worth highlighting the presence of scientists from prestigious universities from the United States, United Kingdom, Australia, Russia, Germany, Japan, France, Canada, and many others.
The BIAL grants are promoted biannually.

Reference code: PT/FB/BL-2020
Location: BF-GMS
Title:
2020 Grants
Start date: 2021-01

Reference code: PT/FB/BL-2020-381
Location: BF-GMS
Title:
381 - Pathways from prenatal and postnatal stress to sleep quality across childhood: The role of the amygdala and cortisol
Duration: 2021-09 - 2024-04
Researcher(s):
Desana Kocevska, Annemarie Luik
Institution(s): Department of Epidemiology, Erasmus Medical Center, Rotterdam (The Netherlands)
Contents: Contents:
Application form
Correspondence
Research Funding Agreement
Progress report
Final report
Articles
Language: eng
Author:
Kocevska, D.
Secondary author(s):
Luik, A.
Number of reproductions:
1
Keywords:
Sleep / Stress / Amygdala / Cortisol / Psychophysiology

Reference code: PT/FB/BL-2020-381.02
Location: BF-GMS
Title:
The multidimensionality of sleep in population-based samples: A narrative review
Publication year: 2022
URL:
https://onlinelibrary.wiley.com/doi/10.1111/jsr.13608
Abstract/Results: The identification of optimal sleep duration recommendations for the general population has long been an important goal on the public health agenda, as both short and long sleep duration have been linked to unfavourable health outcomes. Yet, sleep is more than duration alone and can be described across multiple domains, such as timing, regularity, satisfaction, alertness, and efficiency. We reviewed observational population-based studies that examined differences in age, sex, and origin across multiple dimensions of sleep. Reviewed literature suggests an increasing prevalence of insomnia symptoms, shorter and less deep sleep in old age. Overall, women report poorer sleep quality than men despite objective measures revealing shorter and more fragmented sleep in men. Minorities generally have poorer quantity and quality of sleep, but multi-ethnic studies have reported mixed results regarding the subjective experience of sleep. In sum, effects of age, sex and origin differ across sleep dimensions, thereby suggesting that the multidimensionality of sleep and how these different aspects interact should be studied across individuals. Studies should include both self-reported measures and objective assessments in diverse population-based samples, as both aspects are important to understand sleep health in the general population. Data-driven descriptions could provide researchers and clinicians with insights into how well individuals are sleeping and offer concrete targets for promotion of sleep health across the population.
Accessibility: Document exists in file
Language:
eng
Author:
van de Langenberg, S.
Secondary author(s):
Kocevska, D., Luik, A.
Document type:
Article
Number of reproductions:
1
Reference:
van de Langenberg, S., Kocevska, D. & Luik, A. (2022). The multidimensionality of sleep in population-based samples: A narrative review. Journal of Sleep Research, 31(4). https://doi.org/10.1111/jsr.13608
2-year Impact Factor: 4.400|2022
Times cited: 25|2025-09-24
Indexed document: Yes
Quartile: Q2
Keywords: Actigraphy / Ethnicity / Napping / Polysomnography

The multidimensionality of sleep in population-based samples: A narrative review

The multidimensionality of sleep in population-based samples: A narrative review