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Science 24 December 1971:
Vol. 174. no. 4016, pp. 1354 - 1356
DOI: 10.1126/science.174.4016.1354
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Articles
Stage 4 Sleep: Influence of Time Course Variables
W. B. Webb 1 and
H. W. Agnew Jr. 1
1 Department of Psychology, University of Florida, Gainesville 32601
Age, length of prior wakefulness, length of time asleep, and a circadian influence all affect stage 4 sleep. The amount of stage 4 sleep decreases as subject's age increases and as time asleep increases. Longer periods of wakefulness before sleep result in greater amounts of stage 4 sleep in the first 3 hours of sleep. Sleep periods that begin at times other than the regular onset time tend to produce less stage 4 sleep; this decrease suggests a circadian effect.
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