I've been in this situation. I can't sleep well in the dormitory. I always toss and turn. I couldn't fall asleep until everyone in the dormitory fell asleep. But when I go to the library to read a book, I can fall asleep on my stomach and drool as soon as I sit down. Psychological reasons: there are often noisy people in the dormitory, or people you hate, which often affect your sleep. After a long time, I am not used to it. The solution is to exercise more and sleep less.