When we were in college, we said it indirectly at first. At that time, there was a girl in our dormitory who really liked watching videos after turning off the lights and didn't like wearing headphones. Even though she wears headphones, she likes to make a lot of noise, which really gives me a headache. But everyone didn't know each other at first, and most of them were very patient. Nobody said anything. Later, the next-door neighbor told us that they were also disturbed, and we started talking, just in a joking manner. For example, Xiao Yang is the roommate who plays video outside after lights out, so we told me that during class today, someone in the dormitory next door said that there was still video sound in our dormitory after lights out. By the way, my roommate's movements have been much quieter since then.
Later, when everyone got familiar with it, they all said it directly, and sometimes I didn't pay much attention. For example, after turning off the lights, I chatted happily and didn't notice that the video was still on. Then my roommate in the lower bunk will knock on my bed and tell me, keep your voice down, I'm ready for bed. I will consciously turn off the video. I won't feel unhappy either. It's better to talk about it after getting familiar with it. If you are so tactful, it will not get along well with you. The other person may think that you are very scheming.
This is the method of our dormitory at that time. You can adjust it slightly according to your own situation. I think since I'm in a dormitory anyway, I'd better speak my mind. Don't hold it back, it will only make you more unhappy.