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Physiology of sleep and dreaming - page 8 / 26

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Who sleeps?

Mammals and birds

Opossums, sloths, bats: 19-20 hours daily

Cats, dogs, rodents: 12-15 hours daily

Ruminant herbivores: 2-3 hours daily

Reptiles, amphibians, fish, and insects have cycles of inactivity

Note that sleep time does not correlate with waking activity levels, but does relate to waking vulnerability.

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