Drinking milk before going to bed not only helps you sleep, but also helps your body absorb nutrients. Milk contains tryptophan, which is synthesized by serotonin and can promote sleep. Usually it only takes a glass of milk to put people to sleep.
Drinking water before going to bed promotes sleep at night and supplements water to the skin and body. But it is also harmful. For example, drinking water before going to bed can easily lead to edema, such as swollen eyes.