Insomnia is something I've dealt with for most of my adult life. I followed everything you were supposed to do, got blackout curtains, no coffee, no alcohol, exercised, but still had issues. This article below helped me realize the insomnia is actually a form of performance anxiety. Sitting in bed tossing and turning, mind racing wishing you were asleep is the problem. You have to train yourself that you can sleep and to not fear it, gain the confidence that you can fall asleep.
https://ilya.sukhar.com/blog/an-algorithmic-solution-to-inso...