Definitions for sleep stages
This page provides all possible meanings and translations of the word sleep stages
U.S. National Library of Medicine
Periods of sleep manifested by changes in EEG activity and certain behavioral correlates; includes Stage 1: sleep onset, drowsy sleep; Stage 2: light sleep; Stages 3 and 4: delta sleep, light sleep, deep sleep, telencephalic sleep.
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"sleep stages." Definitions.net. STANDS4 LLC, 2014. Web. 24 Sep. 2014. <http://www.definitions.net/definition/sleep stages>.