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Erschienen in:
01.09.2010 | Original Contribution
Principal component structure of wake-sleep transition
Quantitative description in multiple sleep latency tests
Erschienen in: Somnologie | Ausgabe 3/2010
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Question of the study
The multiple sleep latency test (MSLT) uses electroencephalograph (EEG) recordings obtained throughout the whole interval of each of several sleep attempts but it scores time to the discrete onset of sleep rather than quantify the degree of transition from the wake to sleep state. The present study employed principal component analysis of EEG spectra to examine the feasibility of quantification and prediction of a gradual transition from wakefulness to sleep in MSLT.
Subjects and methods
The present analysis was based on polysomnograph recordings obtained during 24 hour MSLTs in 9 sleep-deprived, 9 sleep-restricted and 14 sleep-unrestricted subjects.
Results
It was demonstrated that wake and sleep EEG spectra can be reduced to an invariant structure consisting of three largest principal components and these components are strongly associated with sleep latency during 24 hour MSLTs.
Conclusions
The features of the principal component structure of EEG spectra documented in the present study suggest the possibility to enrich the traditional scoring of the discrete event of sleep onset by a theoretically meaningful, parsimonious, and quantitative description of a gradual transition from one state or substate of a sleep-wake continuum to another.