sleep-wake cycle

[ sleep-weyk ]
/ ˈslipˈweɪk /

noun

Physiology. the species-specific biological pattern of alternating sleep and wakefulness, in humans roughly 8 hours of nocturnal sleep and 16 hours of daytime activity.

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LEARN THE SPANISH WORDS FOR THESE COMMON ANIMALS!

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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021