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• W2023894170 startingPage "1505" @default.
• W2023894170 abstract "Afternoon sleepiness is a widespread phenomenon. The present study aimed to test Broughton's hypothesis (Sleep and alertness: chronobiological, behavioral, and medical aspects of napping. New York, NY: Raven Press, 1989. p. 71-98) that afternoon sleep propensity might reflect the circasemidian 12h cycle of slow wave sleep (SWS).Nine subjects (21-27 year) stayed alone under constant darkness (0 lux) without social contact for 72 h. They were allowed to sleep and eat freely. Their polysomnograms during 72 h of constant darkness were analyzed.The total sleep time (TST) accounted for 41.6h (57.9%) of the 72 h and decreased progressively as a function of time. The reduction in TST was dependent on the decrease in sleep stage 2 and rapid eye movement (REM) sleep. The amount of SWS did not significantly change among the days. The circadian (1 cycle/day) and circasemidian (2cycles/day) cycles were observed in SWS. Those accounted for 13.9 and 11.1% of the total variance, respectively. SWS during the time corresponding to daytime occurred 9-10h before and 15-16 h after the nocturnal sleep gate. In addition, weak but significant correlations were observed between the amounts of SWS and the waking time before the sleep episodes (r=0.332) and prior REM sleep (r=-0.236).The present findings suggest that SWS might occur not only always in a homeostatic manner as a function of prior wakefulness, but also as a circasemidian rhythmic function." @default.
• W2023894170 created "2016-06-24" @default.
• W2023894170 creator A5004824381 @default.
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• W2023894170 date "2002-09-01" @default.
• W2023894170 modified "2023-09-24" @default.
• W2023894170 title "Circasemidian 12 h cycle of slow wave sleep under constant darkness" @default.
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• W2023894170 doi "https://doi.org/10.1016/s1388-2457(02)00168-2" @default.
• W2023894170 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/12169334" @default.
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