title: Heart rate variability during sleep and wakefulness in low-birthweight infants.
mesh_terms: D001724:Birth Weight; D004562:Electrocardiography; D005247:Feeding Behavior; D006339:Heart Rate; D006801:Humans; D007231:Infant, Newborn; D012890:Sleep; D012895:Sleep, REM; D014851:Wakefulness