[Perinatal evolution of the sleep cycles in the lamb].
The alternation between NREM-REM sleep occurs in the foetal lamb as an ultradian rhythm with a period of 30-40 min. until 6 to 8 hrs. before birth. Cycling of sleep-wakefulness in the neonate is related to a circadian cycle of exploratory activity and feeding, to an ultradian basic rest activity cycle and to an alternation between NREM-REM within a period of sleep.
D000818:Animals; D000831:Animals, Newborn / Q000502:physiology*; D002940:Circadian Rhythm; D004567:Electrodes, Implanted; D005260:Female; D005333:Fetus / Q000502:physiology; D011247:Pregnancy; D012756:Sheep / Q000502:physiology*; D012890:Sleep; D012894:Sleep Stages; D014851:Wakefulness
Evolution périnatale des cycles de sommeil chez l'agneau