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Time-of-day variations in different measures of sleepiness (MSLT, pupillography, and SSS) and their interrelations

Published online by Cambridge University Press:  25 September 2001

HEIDI DANKER-HOPFE ,
SUSANNE KRAEMER ,
HANS DORN ,
ANDREA SCHMIDT ,
INGRID EHLERT  and
WERNER M. HERRMANN
HEIDI DANKER-HOPFE
Affiliation:
Interdisciplinary Sleep Clinic, Laboratory of Clinical Psychophysiology, Department of Psychiatry, Benjamin Franklin University Hospital, Free University of Berlin, Berlin, Germany
SUSANNE KRAEMER
Affiliation:
Interdisciplinary Sleep Clinic, Laboratory of Clinical Psychophysiology, Department of Psychiatry, Benjamin Franklin University Hospital, Free University of Berlin, Berlin, Germany
HANS DORN
Affiliation:
Interdisciplinary Sleep Clinic, Laboratory of Clinical Psychophysiology, Department of Psychiatry, Benjamin Franklin University Hospital, Free University of Berlin, Berlin, Germany
ANDREA SCHMIDT
Affiliation:
Interdisciplinary Sleep Clinic, Laboratory of Clinical Psychophysiology, Department of Psychiatry, Benjamin Franklin University Hospital, Free University of Berlin, Berlin, Germany
INGRID EHLERT
Affiliation:
Interdisciplinary Sleep Clinic, Laboratory of Clinical Psychophysiology, Department of Psychiatry, Benjamin Franklin University Hospital, Free University of Berlin, Berlin, Germany
WERNER M. HERRMANN
Affiliation:
Interdisciplinary Sleep Clinic, Laboratory of Clinical Psychophysiology, Department of Psychiatry, Benjamin Franklin University Hospital, Free University of Berlin, Berlin, Germany
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Abstract

The aim of the present study is to analyze how well physiological measures of sleepiness derived from pupillography and the Multiple Sleep Latency Test correlate with a subjective measure, the Stanford Sleepiness Scale (SSS) score. The results are based on data from 12 healthy participants, who underwent these tests every 2 hr from 7:00 a.m. until 11:00 p.m. Sleep latencies were correlated with four different variables derived from pupillography and the SSS score. The results indicate that the physiologically based variables correspond very well. This is reflected by similar patterns of time-of-day variations, a good agreement at the group level, and correlations at the individual level, whereas the SSS shows a quite different pattern of variation. The two physiological measures of sleepiness seem to reflect the same aspect of the level of tonic central nervous activation, which is not correlated with the subjective feeling of sleepiness.

Keywords

Subjective and objective sleepinessMultiple Sleep Latency TestPupillographyStanford Sleepiness ScaleTime-of-day variations
Type
Research Article
Information
Psychophysiology , Volume 38 , Issue 5 , September 2001 , pp. 828 - 835
Copyright
2001 Society for Psychophysiological Research

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