Call/text him, "I'm going to bed now. If I know you are going to bed too, I'll sleep well. Otherwise, I'll not sleep well." Add whatever you can, like your health, job, all on the line. Don't wait for a response.
Do it everyday for a month. "Go to bed on time, I'll stop bothering you."
Google "Leonardo da Vinci quote dominion". Or, send him that quote everyday at 10pm.