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Related Experiment Videos

Nighttime drop in body temperature: a physiological trigger for sleep onset?

P J Murphy1, S S Campbell

  • 1Department of Psychiatry, Cornell University Medical College, White Plains, New York, USA.

Sleep
|July 1, 1997
PubMed
Summary

A rapid decline in core body temperature (CBT) promotes sleep initiation and deeper sleep stages. This temperature drop, occurring closer to sleep onset during disentrainment, correlated with increased slow-wave sleep.

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Area of Science:

  • Chronobiology
  • Sleep Science
  • Human Physiology

Background:

  • Core body temperature (CBT) fluctuations are linked to circadian rhythms and sleep-wake cycles.
  • The precise relationship between the rate of CBT decline and sleep initiation remains an area of investigation.

Purpose of the Study:

  • To investigate the association between the maximum rate of decline (MROD) in CBT and sleep onset (SO).
  • To examine how the timing of MROD relative to SO influences sleep quality, including slow-wave sleep (SWS).
  • To assess age-related differences in CBT and SO timing.

Main Methods:

  • Continuous electroencephalograph (EEG) and CBT monitoring were conducted on 44 subjects (19-82 years) over baseline and disentrainment periods.
  • Sleep variables, including SO and sleep stages, were analyzed from polysomnography.

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  • The temporal relationship between MROD and SO was calculated and correlated with sleep quality metrics.

    • Main Results:

    • MROD occurred approximately 60 minutes before SO on the baseline night and 44 minutes before SO during disentrainment.
    • During disentrainment, a shorter interval between MROD and SO correlated with increased SWS.
    • Older subjects exhibited advanced MROD and SO timing compared to younger subjects during disentrainment.

    Conclusions:

    • A rapid decline in CBT appears to facilitate sleep initiation.
    • The proximity of MROD to SO may influence the amount of deep sleep obtained.
    • Age-related shifts in CBT and SO timing occur under conditions of temporal and social isolation.