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slow-wave sleep

[sloh-weyv]
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.
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Compare REM sleep.

Origin of slow-wave sleep

First recorded in 1965–70
Also called S sleep.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018