Reports

Sleep in mammals: ecological and constitutional correlates

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Science  12 Nov 1976:
Vol. 194, Issue 4266, pp. 732-734
DOI: 10.1126/science.982039

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.

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