Simplest way: get exhaustively I-can't-keep-my-eyes-open-tired.

Don't sleep 10 hours every day. Wake up at 6:30am starting tomorrow. Go to sleep when you get tired. Repeat.

It also helps to do things in the real world. If you're spending all your time inside not moving around very much, you'll end up with that annoying situation where it's 2am, you're tired, but you can't fall asleep.