Science. 1976 Nov 12;194(4266):732-4.

Sleep in mammals: ecological and constitutional correlates.

Abstract

The interrelationships between sleep, ecological, and constitutional variables were assessed statistically for 39 mammalian species. Slow-wave sleep is negatively associated with a factor related to body size, which suggests that large amounts of this sleep phase are disadvantageous in large species. Paradoxical sleep is associated with a factor related to predatory danger, which suggests that large amounts of this sleep phase are disadvantageous in prey species.

PMID:: 982039; [PubMed - indexed for MEDLINE]

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