Sleep and estivation (shallow torpor): continuous processes of energy conservation

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Science  08 Jun 1979:
Vol. 204, Issue 4397, pp. 1098-1100
DOI: 10.1126/science.221974


Estivation (shallow torpor) in the round-tailed ground squirrel (Citellus tereticaudus) is entered through electrophysiologically defined states of sleep. Rapid-eye-movement sleep diminishes as body temperature falls in such a way that, at a body temperature of 26 degrees to 28 degrees C, torpor is characterized by almost continuous slow-wave sleep isomorphic with that observed at euthermic body temperatures.