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Effects of context on sleepiness self-ratings during repeated partial sleep deprivation.
Stockholm University, Faculty of Social Sciences, Stress Research Institute.
Stockholm University, Faculty of Social Sciences, Stress Research Institute.
2008 (English)In: Chronobiol Int, ISSN 1525-6073, Vol. 25, no 2, 271-8 p.Article in journal (Refereed) Published
Abstract [en]

Effects of context on sleepiness self-ratings during repeated partial sleep deprivation.

Akerstedt T, Kecklund G, Axelsson J.

Stress Research Institute, Stockholm University, Stockholm, Sweden. torbjorn.akerstedt@ki.se

Ratings of subjective sleepiness are often used in laboratory and field studies of sleep loss and shifted sleep hours. Some studies suggest that such ratings might fail to reflect sleepiness as shown in physiology or performance. One reason for this may be the influence of the context of the rating. Social interaction or physical activity may mask latent sleepiness. The present study attempted to approach this question. Nine subjects participated in a partial sleep-deprivation experiment (five days of 4 h of time in bed [TIB]), preceded by two baseline days (8 h TIB) and followed by three recovery days (8 h TIB). Sleepiness was self-rated on the Karolinska Sleepiness Scale (KSS; scores of 1-9) after a period of relaxation, after a reaction-time test, and after 30 min of free activities. The results showed a strong increase in subjective sleepiness during sleep restriction and a significant difference between conditions. Free activity reduced the self-rated subjective sleepiness by 1.1 KSS units compared to the level of sleepiness self-rated at the end of the reaction-time test. Thus, the results of this study indicate that the context of a sleepiness rating affects the outcome of the rating.

Place, publisher, year, edition, pages
2008. Vol. 25, no 2, 271-8 p.
Keyword [en]
Sleepiness, Reaction time, Karolinska Sleepiness Scale, Context of sleepiness self-assessment
National Category
Medical and Health Sciences
Identifiers
URN: urn:nbn:se:su:diva-14161ISI: 000257613200010PubMedID: 18484365OAI: oai:DiVA.org:su-14161DiVA: diva2:180681
Note
Internt publ.nr. P2655Available from: 2008-06-17 Created: 2008-06-17 Last updated: 2011-01-10Bibliographically approved

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