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.

QUIZZES

Can You Ace This Quiz About “Compliment” vs. “Complement”?
Take this quiz to see if you really know the difference between “compliment” and “complement"!
Question 1 of 11
“Compliment” and “complement” had a shared meaning a long time ago, but today they are no longer interchangeable.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020