I think one thing that helps me is to at least three hours before you're going to bed begin to take away things which keep you up and hyper. And don't have any caffeine. Just have sleepy tea and begin to read. Putting your phone away etc
Determine what time you want to go to bed and start your wind down routine a couple of hours before. Start gradually turning down lights. Disconnect from electronics. Maybe do a sleeping yoga routine and turn down the air. Do a sleep meditation focusing on breathe and maybe listen to a sleep story as you drift off. Know it takes time to reset the Circadian Rhythm and be relaxed about it.