Hello, milk: milk contains two hypnotic substances: one is tryptophan; The other is peptides that can regulate physiological functions, which can combine with the central nervous system and play an anesthetic and analgesic role similar to opium, making people feel comfortable. Drinking a glass of milk before going to bed can make people fall asleep. Millet: Among all grains, millet contains the most tryptophan, which has the functions of calming, calming and helping sleep. In addition, millet contains a lot of starch, which makes people feel full after eating, which can promote insulin secretion and increase the amount of tryptophan entering the brain.