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Related Experiment Videos

Are ground squirrels sleep deprived during hibernation?

L Trachsel1, D M Edgar, H C Heller

  • 1Department of Biological Sciences, Stanford University, California 94305-5020.

The American Journal of Physiology
|June 1, 1991
PubMed
Summary

Hibernation conserves energy, but low body temperatures impair sleep

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Area of Science:

  • Comparative physiology
  • Sleep science
  • Hibernation research

Background:

  • Hibernation is an energy conservation strategy linked to sleep mechanisms.
  • During hibernation, animals undergo periodic arousals to a euthermic state.
  • Ground squirrels (Spermophilus lateralis) exhibit specific sleep patterns during hibernation.

Purpose of the Study:

  • To investigate the relationship between hibernation, body temperature, and sleep quality.
  • To test the hypothesis that low body temperatures during hibernation inhibit sleep's restorative functions.
  • To explore the role of accumulated sleep debt in timing hibernation arousals.

Main Methods:

  • Electroencephalogram (EEG) spectral analysis was used to assess sleep intensity.
  • Cortical slow-wave activity was measured during sleep periods following hibernation.
  • Sleep intensity was compared after varying durations of hibernation bouts.

Main Results:

  • Cortical slow-wave intensity was highest at the start of euthermic periods and decreased over time.
  • Sleep slow-wave intensity was greater following longer hibernation bouts.
  • These findings suggest hibernation impairs sleep's restorative capacity.

Conclusions:

  • Low body temperatures during hibernation are incompatible with restorative sleep.
  • Animals must periodically arouse from hibernation to achieve the benefits of euthermic sleep.
  • The timing of hibernation arousals may be influenced by the need to repay sleep debt.

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