I want my bf to prioritize my work/sleep over him working at his computer until 1am
Is it bothering you that much?
Yes, and especially when I beg him to do something with me and he turns me down, and then after I go to bed and he still works.
It's understandable to want some peace and quiet when sleeping at night. Try to make a schedule with him and everything stops at bedtime.
We don't have to talk about this again and again. If he can't get it by now, things won't change. He'll figure it out when he loses me.
It sounds like this is a problem that has been going on for some time, and I hope that you have tried to talk it over with him. If you haven't told him directly, he might not realize that he is bothering you at night, so be sure that you let him know before you do anything more drastic.