24-Hour sleep patterns. A comparison between 2- to 3-year-old and 4- to 6-year-old children.
D000367:Age Factors; D002648:Child; D002657:Child Development; D002675:Child, Preschool; D002940:Circadian Rhythm; D004569:Electroencephalography; D005260:Female; D006801:Humans; D008297:Male; D012894:Sleep Stages; D012895:Sleep, REM