Age-related changes in sleep characteristics.
D000328:Adult; D000368:Aged; D000375:Aging; D002675:Child, Preschool; D003071:Cognition; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012890:Sleep; D012894:Sleep Stages; D012895:Sleep, REM; D014851:Wakefulness