Sleep patterns during afternoon naps in the young and elderly.
D000328:Adult; D000367:Age Factors; D000368:Aged; D002940:Circadian Rhythm; D004325:Dreams; D004569:Electroencephalography; D004585:Electrooculography; D005260:Female; D006801:Humans; D008297:Male; D012890:Sleep; D007319:Sleep Initiation and Maintenance Disorders; D012894:Sleep Stages; D012895:Sleep, REM; D013997:Time Factors