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Related Experiment Video

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Polygraphic Recording Procedure for Measuring Sleep in Mice

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Published on: January 25, 2016

Hibernation in a primate: does sleep occur?

Marina B Blanco¹, Kathrin H Dausmann², Sheena L Faherty³

¹Duke Lemur Center , 3705 Erwin Road, Durham, NC 27705 , USA.

Royal Society Open Science

|November 18, 2016

Summary

Hibernating lemurs, unlike other hibernators, do not sleep during torpor. Instead, sleep occurs only during spontaneous arousals, with different species showing variations possibly due to hibernaculum temperature.

Keywords:

REM hibernation lemur metabolic rates non-REM primate

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Area of Science:

* Zoology
* Neuroscience
* Physiology

Background:

* Hibernation involves physiological downregulation, with periodic arousals needed to maintain essential functions.
* Sleep is generally incompatible with hypometabolic states, yet some hibernating primates exhibit sleep-like states during torpor.
* The dwarf lemur (Cheirogaleus medius) shows rapid eye movement (REM)-like states during hibernation at higher temperatures.

Purpose of the Study:

* To investigate hibernation physiology and spontaneous arousal patterns in two lemur species (C. crossleyi and C. sibreei).
* To compare these patterns with the dwarf lemur (C. medius) and non-primate hibernators.
* To explore the influence of hibernaculum temperature on sleep during hibernation.

Main Methods:

* Electroencephalographic (EEG) recordings were performed on hibernating lemurs.
* Temperature data and metabolic rates were collected during torpor and arousal phases.
* Data were analyzed and compared across species and with existing literature.

Main Results:

* Lemurs C. crossleyi and C. sibreei exhibited monotonous ultra-low voltage EEG during torpor, with no sleep observed.
* Spontaneous arousals occurred, during which non-REM and REM sleep-like stages were present.
* Unlike C. medius, these species exclusively displayed sleep during arousals, not torpor.

Conclusions:

* Hibernation patterns in C. crossleyi and C. sibreei resemble those of temperate non-primate hibernators.
* Sleep during hibernation is restricted to spontaneous arousal periods in these lemur species.
* Differences in sleep patterns are likely influenced by hibernaculum temperatures, impacting physiological regulation during hibernation.