title: Sleep: physiologic aspects.
mesh_terms: D000328:Adult; D000818:Animals; D001143:Arousal; D001683:Biological Clocks; D001921:Brain / Q000502:physiology; D001933:Brain Stem / Q000502:physiology; D002415:Cats; D002540:Cerebral Cortex / Q000502:physiology; D004569:Electroencephalography; D006801:Humans; D007362:Intensive Care Units; D008991:Monitoring, Physiologic; D012890:Sleep; D012892:Sleep Deprivation; D012893:Sleep Wake Disorders; D012895:Sleep, REM; D013312:Stress, Physiological