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  • Title: Slow wave sleep, shallow torpor and hibernation: homologous states of diminished metabolism and body temperature.
    Author: Berger RJ.
    Journal: Biol Psychol; 1984 Dec; 19(3-4):305-26. PubMed ID: 6395910.
    Abstract:
    Until recently, sleep and hibernation were not usually considered to be closely related states (e.g. Dement, 1967). However, two current lines of research point toward a system of relations between caloric intake, thermogenesis, metabolic rate and adiposity in the regulation of the energy balance of warm-blooded animals (endotherms). One line indicates that sleep, shallow torpor and hibernation are homologous energy conserving processes, lying on a continuum of decreasing metabolism and body temperature (Tb). The other line indicates that the metabolic reductions brought about by sleep, shallow torpor and hibernation are regulated in accordance with periodic ecological factors affecting energy intake and energy balance.
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