We mothers have, at our disposal, the perfect sleep-inducers. They are called breasts. Breastmilk contains a wonderful hormone called cholecystokinin (CCK). CCK induces sleepiness, both in the baby and the mother. When the baby sucks, CCK is released within the mother to help her rest and relax. Many mothers say that breastfeeding tires them out. Certainly caring for a new baby is tiring for all mothers, but the sleepiness caused by breast-feeding is to ensure that the mother gets the rest she needs.
In the baby, CCK release is caused by sucking and when food, especially fat, enters the stomach. There are actually two CCK peaks, one at the end of a feed, and the other higher peak between 30 and 60 minutes after the feed. The baby sucks, gets sleepy, dozes off for a while then wakes again for a top-up feed. That higher-fat feed causes the second peak and the baby goes into deeper sleep. Top-up feeds are also great for the mother's milk supply.
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