Definition: A physiologic state of relative unconsciousness and inaction of the voluntary muscles, the need for which recurs periodically. The stages of sleep have been variously defined in terms of depth (light, deep), EEG characteristics (delta waves, synchronization), physiologic characteristics (REM, NREM), and presumed anatomic level (pontine, mesencephalic, rhombencephalic, rolandic, etc.).
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Examples: glitazone, GI cocktail, etc.