title: Individual differences in sleep length.
mesh_terms: D000293:Adolescent; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D010551:Personality; D011603:Psychophysiology; D012890:Sleep; D012895:Sleep, REM