Drinking a glass of milk before going to bed can help you sleep and can also absorb the calcium in the milk, but it is recommended that you drink it about an hour before going to bed. Milk is rich in calcium and protein, drink milk before bedtime to improve the quality of sleep and promote bone development of children have a greater help, but it is recommended that children drink 1 hour before bedtime better, if you drink milk at night and go to bed, without brushing and rinsing, may lead to dental caries, not conducive to oral hygiene and cleanliness. In addition, milk should not drink too much, 500 milliliters per day can be, because the usual food also has calcium content, to avoid too much drinking lead to calcium poisoning.