What should my roommate do if he doesn't sleep in the middle of the night and hits dj with a stereo in the dormitory?

Remind him, just say, "Can you keep your voice down, it's affecting my sleep ..." If he still doesn't converge, get up and turn it off for him. If there is excessive behavior, talk to the guide or the resident teacher. It's so noisy that I don't think the housekeeper can move. It will definitely affect people in other rooms, right?

Some people are selfish and unconsciously think for themselves, so it is necessary for us to talk to him. After all, it will affect the efficiency of class or work the next day.