Overnight dynamics in scale-free and oscillatory spectral parameters of NREM sleep EEG

Unfolding the overnight dynamics in human sleep features plays a pivotal role in understanding sleep regulation. Studies revealed the complex reorganization of the frequency composition of sleep electroencephalogram (EEG) during the course of sleep, however the scale-free and the oscillatory measure...

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Veröffentlicht in:Scientific reports Jg. 12; H. 1; S. 18409 - 12
Hauptverfasser: G. Horváth, Csenge, Szalárdy, Orsolya, Ujma, Péter P., Simor, Péter, Gombos, Ferenc, Kovács, Ilona, Dresler, Martin, Bódizs, Róbert
Format: Journal Article
Sprache:Englisch
Veröffentlicht: London Nature Publishing Group UK 01.11.2022
Nature Publishing Group
Nature Portfolio
Schlagworte:
631/378/1385/2640
631/378/1385/2641
631/378/1385/519
EEG
Electroencephalography
Humanities and Social Sciences
Humans
multidisciplinary
NREM sleep
Science
Science (multidisciplinary)
Sleep
Sleep - physiology
Sleep Stages - physiology
Sleep, Slow-Wave
ISSN:2045-2322, 2045-2322
Online-Zugang:Volltext
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Zusammenfassung:Unfolding the overnight dynamics in human sleep features plays a pivotal role in understanding sleep regulation. Studies revealed the complex reorganization of the frequency composition of sleep electroencephalogram (EEG) during the course of sleep, however the scale-free and the oscillatory measures remained undistinguished and improperly characterized before. By focusing on the first four non-rapid eye movement (NREM) periods of night sleep records of 251 healthy human subjects (4–69 years), here we reveal the flattening of spectral slopes and decrease in several measures of the spectral intercepts during consecutive sleep cycles. Slopes and intercepts are significant predictors of slow wave activity (SWA), the gold standard measure of sleep intensity. The overnight increase in spectral peak sizes (amplitudes relative to scale-free spectra) in the broad sigma range is paralleled by a U-shaped time course of peak frequencies in frontopolar regions. Although, the set of spectral indices analyzed herein reproduce known age- and sex-effects, the interindividual variability in spectral slope steepness is lower as compared to the variability in SWA. Findings indicate that distinct scale-free and oscillatory measures of sleep EEG could provide composite measures of sleep dynamics with low redundancy, potentially affording new insights into sleep regulatory processes in future studies.
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ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-022-23033-y