Sharp and sleepy: evidence for dissociation between sleep pressure and nocturnal performance.
J Sleep Res. 2008-03-01; 17(1): 11-15
DOI: 10.1111/j.1365-2869.2008.00629.x
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1. J Sleep Res. 2008 Mar;17(1):11-5. doi: 10.1111/j.1365-2869.2008.00629.x.
Sharp and sleepy: evidence for dissociation between sleep pressure and nocturnal
performance.
Galliaud E(1), Taillard J, Sagaspe P, Valtat C, Bioulac B, Philip P.
Author information:
(1)GENPPHASS, CHU Pellegrin, Bordeaux, France.
While sleep restriction decreases performance, not all individuals are equal with
regard to sensitivity to sleep loss. We tested the hypothesis that performance
could be independent of sleep pressure as defined by EEG alpha-theta power.
Twenty healthy subjects (10 vulnerable and 10 resistant) underwent sleep
deprivation for 25 h. Subjects had to rate their sleepiness (Karolinska
Sleepiness Scale) and to perform a 10-min psychomotor vigilance task (PVT) every
2 h (20:00-08:00 hours). Sleep pressure was measured by EEG power spectral
analysis (alpha-theta band 6.0-9.0 Hz). Initial performance, EEG spectral power
and KSS score were equal in both groups (ANOVA, NS). The performance of
vulnerable subjects significantly increased during the night (rANOVA, P < 0.01),
whereas resistant subjects globally sustained their performance. Homeostatic
pressure and subjective sleepiness significantly increased during the night
(rANOVA, P < 0.01) identically in both categories (rANOVA, NS). Resistant
subjects sustained their reaction time independently of the increase in
homeostatic pressure. The phenotypic determinants of vulnerability to extended
wakefulness remain unknown.
DOI: 10.1111/j.1365-2869.2008.00629.x
PMID: 18275550 [Indexed for MEDLINE]