@jc76
Do not nap during the day.
R E A D something not too interesting. Your brain can either perseverate on your troubles, or re-focus on what's going on in the book. It gets bored, then sleepy.
It works well, but not all the time. If the reading has meaning, and you don't fall asleep, at least you may have learned something.
My book, a long time ago was Self Psychology and the Treatment of the Narcissistic Personality. Dense , but instructive.
Zen style meditation works. "I'm gonna sit here til the sh-t in my head stops."
Also don't fight it by obsessing about not being able to fall asleep. That just makes it worse. 🤫💤🤭