only one i know is clear your mind, purposely force yourself not to think about anything, and hope it clicks where you fall asleep.
been having major sleeping issues lately. don't really want to mess with sleeping pills either since you become dependent on those, been there with Afrin...lol. not trying to get into a bad habit.
I have serious sleeping problems, since I was kid. Really overactive mind. I would say to try melatonin. I know you said no pills, but it's a natural hormone. The only side effect is that it loses its useless if your in an angry state. Like because of a girl or something.
Another thing you might want to try is to use your sleeping room for sleeping only. Don't do any internet browsing, or other kinds of work in there.