This particular hormone assists with the sleep - wake cycle of a patient. (consumerhealthdigest.com)
The sleep - wake cycle in babies is mainly dependent upon their hormonal levels and core body temperature. (newkidscenter.com)
Sleep rhythms begin to develop at around 6 weeks, and most babies are developmentally capable of regular sleep - wake cycles by 3 to 6 months. (johnsonsbaby.com)