If you are a physically developed teenager, I suggest you eat more foods rich in protein and vitamins every night.
Then drink a cup of hot milk between half an hour and an hour after dinner. At this time, the protein needed by the human body can be fully absorbed from the milk, and eating and drinking in the morning can also contribute to a day's study.
Of course, milk can be drunk at any time. The reason why we should avoid drinking milk on an empty stomach when we get up in the morning is because for some people with poor digestion in the stomach, drinking milk on an empty stomach in the morning will burden the stomach and easily lead to "milk production reaction", which is what we usually call nausea.
If you feel sleepy at noon, it is ok to drink a glass of milk. Drinking milk can help you have a good sleep. Don't just rest for a few minutes at noon, even if you rest for a few minutes, you will be full of energy and improve your learning efficiency throughout the afternoon. ?
Be careful not to eat too much before drinking milk at night. Eating too much will not only weaken the quality of sleep, but also make it uncomfortable to drink milk after eating too much. ?
Finally, I suggest that if you are an adult, you'd better not smoke for an hour or two after drinking milk. It's really bad for your health and more harmful than usual!