In order to play the role of a tranquil sleep aid, milk should be best drunk one hour before going to bed at night to replenish the body’s high quality protein, which can play a good role in promoting sleep and improving sleep quality. So to play the role of tranquilizing sleep aid, milk should be drunk one hour before bedtime at night for the best effect. If you want to play the role of milk for calcium to the best, you should drink it in the morning, because after drinking milk in the morning, after a morning and an afternoon of outdoor activities, after the sun’s ultraviolet radiation, the skin produced vitamin D3, can make the morning drink in the milk among the absorption rate of calcium to further improve, can play the maximum effect of calcium. So in order to calm the brain and promote sleep, milk is best drunk an hour before bedtime. In order to strengthen the bones and prevent osteoporosis, milk should be drunk in the morning, the key is to see what effect of milk to maximize.