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Updated: Jun 13, 2026

Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments
Published on: August 8, 2019
Impaired sleep in chronic fatigue syndrome: how is it best measured?
Laura Creti1, Eva Libman, Marcel Baltzan
1Department of Psychiatry, SMBD Jewish General Hospital, 4333 Cote Ste Catherine Road, B-28, Montreal, Quebec, H3T 1E4, Canada. laura.creti@mail.mcgill.ca
Abstract:
The goal was to examine comparative efficacy of polysomnography, actigraphy, and self-report in evaluating the sleep/wake experience of individuals with chronic fatigue syndrome (CFS). Sleep parameters were evaluated by the three measurement modalities for the same night in 49 participants with CFS. Psychological and daytime functioning were measured by self-report. Results indicate that: (a) objectively measured nocturnal sleep time effectively approximated subjective experience although nocturnal wakefulness did not; (b) total sleep time and sleep efficiency differentiated individuals with and without insomnia complaints; (c) daytime sleepiness, fatigue, and non-refreshing sleep were not reflected by the objective sleep-related measures (polysomnography and actigraphy).
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