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[Perinatal evolution of the sleep cycles in the lamb]
Comptes Rendus Hebdomadaires Des Seances De L'Academie Des Sciences. Serie D: Sciences Naturelles
|March 1, 1976
Abstract:
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.