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slow-wave sleep

[ sloh-weyv sleep ]

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 Compare REM sleep ( def ).


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Word History and Origins

Origin of slow-wave sleep1

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

The neural replay happened only during slow-wave sleep, when dreams tend to be infrequent, dull, and go unremembered.

This may be because they go into heavy, slow-wave sleep, which is the deepest stage of sleep, making it difficult to return to the waking world.

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slow waveslow-witted