Milk can be helpful for sleep to some extent. Because milk is rich in calcium and lactic acid, it also promotes the absorption of calcium, and when the sleep center has enough calcium, the corresponding excitability can be reduced, making it easy to produce a sense of sleepiness. In addition, milk also contains tryptophan, tryptophan is the precursor of 5-hydroxytryptophan, and 5-hydroxytryptophan is a substance that can make the body happy, that is, 5-hydroxytryptophan elevated can make people’s mood more happy, relaxed, more conducive to sleep. 5-hydroxytryptophan is also the precursor of melatonin substances, drinking milk can make the human melatonin increase, for sleep will have a greater regulatory effect, can regulate the biological clock It is a good idea to drink milk to help you sleep. Of course, in addition to milk there are other foods for sleep is also helpful, such as millet porridge and bean products, to a certain extent, can help sleep, but of course not cause before going to bed must drink milk, to avoid the formation of dependent sleep disorders.