Sleep Duration and Body Temperature

The Durk Pearson & Sandy Shaw®
Life Extension NewsTM
Volume 6 No. 2 • April–May 2003


Sleep Duration and Body Temperature

. . . Czeisler found that subjects who fall asleep when their body temperature is low tend to sleep for short periods, whereas those who fall asleep when their temperature is high will sleep for long periods. Moreover, the relationship between sleep duration and sleep-onset time relative to the temperature cycle is discontinuous. Several hours after the body temperature reaches its low point, sleep duration jumps abruptly from very short periods to very long ones, then slowly decreases back to short durations. This gradual descent leads to the surprising effect that if you stay awake longer than usual and go to sleep later in your body’s temperature cycle, you tend to sleep less, even though you may be exhausted from a late-night party.
— J. J. Collins, in a review of Steven Strogatz,
Sync: The Emerging Science of Spontaneous Order
Hyperion/Allen Lane, 2003
Nature 422:117-118 (2003)

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