[gamerDude]

For me. It is just habit. You go to bed at a certain time. And you reward yourself for doing it. Basically any habit is formed by the set of trigger, action, reward. The trigger is something that happens, an alarm, seeing a time on the clock etc. The action, get ready and go to bed. The reward needs to release dopamine. That can be as easy as just congratulating yourself.

Other methods including enrolling other people into it. Your significant other either going to bed with you or keeping you accountable. Friends who will give real consequences for failure. A system that auto donates money to a charity that you hate or a personal enemy if you don't go to bed in time. Etc.