It is advisable for middle school students to sleep for 8 ~ 9 hours every day. No more, no less. Lack of sleep will make you stupid. Affect learning. Amnesia The best sleep time is from nine to eleven. Twelve to one, two to three. This is the most vigorous time for the human body. Easy to fall asleep. You'd better go to bed before eleven o'clock. Night is the time to detoxify the internal organs. The night is long, too Going to bed early is good for health. Good for the skin.