When the Human Circadian System is Caught Napping: Evidence for Endogenous Rhythms Close to 24 Hours | Zendy

Scott S. Campbell | Zendy; Drew Dawson∥ | Zendy; J. Zulley | Zendy

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When the Human Circadian System is Caught Napping: Evidence for Endogenous Rhythms Close to 24 Hours

Author(s) -

Scott S. Campbell,

Drew Dawson∥,

J. Zulley

Publication year - 1993

Publication title -

sleep

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.222

H-Index - 207

eISSN - 1550-9109

pISSN - 0161-8105

DOI - 10.1093/sleep/16.7.638

Subject(s) - circadian rhythm , nap , rhythm , chronobiology , core temperature , rest (music) , psychology , sleep (system call) , endogeny , medicine , endocrinology , neuroscience , computer science , operating system

It is now well acknowledged that napping constitutes an inherent component of the human circadian system. To date, however, few studies have examined the effects of spontaneous napping on human free-running rhythms. This study investigated the free-running circadian periods of rest/activity and body core temperature in a group of young subjects who were permitted to nap during their time in isolation. Based on the frequency of self-reported sleep bouts, subjects were classified as Nappers or Nonnappers. Nappers exhibited free-running rhythms in both rest/activity and body core temperature that were not significantly different from 24 hours. Nappers showed a tendency for shorter free-running periods in both variables, when compared with Nonnappers. These findings emphasize the need for careful reassessment of data obtained from traditional free-run protocols.

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