When I had a similar problem, following good 'sleep hygiene' was what was recommended to me. Well, to be honest I still have the same problem, but when I'm disciplined enough to follow these rules they tend to help.

Basically: Exercise, don't look at screens before you go to bed, go to bed at a regular time, make sure your sleeping place is just a place to sleep and a few other things.

https://sleepfoundation.org/sleep-topics/sleep-hygiene