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The sleep-evoked decrease of body temperature

J Barrett1, L Lack, M Morris

  • 1School of Social Sciences, Flinders University of South Australia, Bedford Park.

Sleep
|February 1, 1993
PubMed
Summary
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Sleep significantly lowers deep body temperature, impacting circadian rhythm. This study used a constant routine to isolate sleep

Area of Science:

  • Chronobiology
  • Human Physiology

Background:

  • Circadian rhythm of body temperature has endogenous and exogenous components.
  • Previous studies lacked controls, failing to isolate sleep's effect on body temperature.

Purpose of the Study:

  • To determine the specific effect of sleep on deep body temperature rhythm.
  • To establish a reliable methodology for studying circadian rhythm variations.

Main Methods:

  • Eight healthy sleepers underwent 24-hour rectal temperature monitoring under controlled laboratory conditions.
  • A constant routine protocol controlled for exogenous influences, with sleep permitted in one condition.

Main Results:

  • Sleep onset led to a faster drop and lower body temperature (mean decrease of 0.31°C).

Related Experiment Videos

  • Fourier regression revealed significant 24-hour and 12-hour rhythms in both conditions.
  • Sleep altered circadian rhythm parameters, increasing amplitude and decreasing the mean.

    • Conclusions:

    • Sleep per se significantly lowers deep body temperature.
    • Constant routine methodology and Fourier regression are recommended for accurate circadian rhythm studies.