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sleep'-wake' cy"cle



Pronunciation: (slēp'wāk'), [key]
Physiol.the species-specific biological pattern of alternating sleep and wakefulness, in humans roughly 8 hours of nocturnal sleep and 16 hours of daytime activity.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

sleep sofasleepwalk

 

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