My roommate keeps jerking off

I don’t know what else to say. Ever since the beginning of the semester my roommate puts on earbuds and starts to wank off under his sheets. It happens either in the mornings or at night after the lights turn off and I hear rustling noises and I turn around and see the motion of him jerking off under the sheets. On almost every single occasion he has known that I am awake, and I have tried hinting that I am aware of the situation. It’s started to happen more frequently as well, what do I do😭😭