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slow-wave sleep

American  
[sloh-weyv sleep] / ˈsloʊˈweɪv ˈslip /

noun

Physiology.

  1. a recurrent period of deep sleep, typically totaling five or six hours a night, distinguished by the presence of slow brain waves and by very little dreaming. SWS

Etymology

Origin of slow-wave sleep

First recorded in 1965–70; slow ( def. ) + wave ( def. )

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.