title: Sleep in normal and pathological aging.
mesh_terms: D000328:Adult; D000375:Aging; D001921:Brain / Q000502:physiology; D003700:Delta Rhythm; D003866:Depressive Disorder / Q000503:physiopathology; D004569:Electroencephalography; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012701:Serotonin / Q000502:physiology; D012890:Sleep / Q000502:physiology*; D007319:Sleep Initiation and Maintenance Disorders / Q000503:physiopathology; D012894:Sleep Stages / Q000502:physiology; D012895:Sleep, REM / Q000502:physiology; D013997:Time Factors; D014851:Wakefulness / Q000502:physiology
chemical_list: D012701:Serotonin