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slowwave sleep

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slow-wave sleep

[sloh-weyv]
–noun Physiology.
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.
Also called S sleep.
Compare REM sleep.


Origin:
1965–70
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Medical Dictionary

Main Entry: slow–wave sleep
Function: noun
: a state of deep usually dreamless sleep that occurs regularly during a normal period of sleep with intervening periodsof REM sleep and that is characterized by delta waves and a low level of autonomic physiological activity called also non-REM sleep, NREM sleep, orthodox sleep, S sleep,synchronized sleep
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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