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  • Title: Sleep and estivation (shallow torpor): continuous processes of energy conservation.
    Author: Walker JM, Garber A, Berger RJ, Heller HC.
    Journal: Science; 1979 Jun 08; 204(4397):1098-100. PubMed ID: 221974.
    Abstract:
    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.
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