I want my roommate to go to bed earlier
Why do you want him to go to be earlier?
I don't want to listen to his stupid music at night.
Roommates can be annoying but you shouldn't push them to change what time they go to bed so they stop making noise. They will get angry and it will make living with them impossible.
I'm going to keep asking him to go to bed earlier tomorrow and if he isn't going to listen, I will make an office complaint.
I don't think that's necessary, you should just talk to him about the noise instead of making him go to bed early.