What should college roommates do if they don't sleep at midnight and disturb our rest?

You can talk to her about this problem from the side first to see if she can accept it and understand your dissatisfaction with her. Don't accuse her of her mistakes with a particularly tough attitude at the beginning, so she will resent your attitude towards him and won't accept your opinions or suggestions, even if she realizes her mistakes in her heart. In fact, no one wants the other party to blame mistakes in front of themselves.

So be sure to tell her this gently from the side. When she hears what you said to her, she may remember what she did. She will pay attention to such behavior in the future and won't let it happen again. If this time, you will find what you said to her, she will take it to heart and correct it. You will find that she has got rid of this problem when she gets along with you in the future, which proves that your roommate is a very sensible person. If you hinted at your roommate before,

But she still doesn't understand you. At this time, you can ask her out alone, or when you eat together, it's best not to have other roommates around. At this time, you can talk to her about this problem. If someone else is around, she will feel embarrassed and may think that such a thing will cause more misunderstandings with you. Don't be tough when you tell her directly. You can infiltrate slowly and let her know what you mean. I believe that if you tell her in this straightforward way, she will correct the problem and she will be grateful to you.