Quality sleep is paramount. I wish I could bottle and sell whatever it is that I do. I have not had a problem sleeping since I vowed to be honest in everything I do, when I was in my late teens. I'm not sure it would work for everyone, but I used to sleep as though someone were coming to get me, one eye open and such like. Now, it is rare that it takes me more than one minute to fall asleep.

"This above all: to thine own self be true," Shakespeare, Hamlet act 1 scene 3

There are other ways to help, with diet and cutting out blue spectrum lighting after dinner. This can increase sleep quality.

https://blog.bulletproof.com/bulletproof-radio-short-report-the-art-and-science-of-sleeping-podcast-188/