Don't watch any kind of screen in the evening. Read a book instead. You'll fall asleep sooner.
Isn't that "conventional wisdom"?
I do watch screens in the morning, but reading in bed (though still a screen, Kindle) still knocks me off in max 15 minutes. I would love to know why... I only know it works.
With this [0] I find i read 2 pages and I fall asleep consistently and really with a will to sleep. My mind wanders into far away lands and empires and says, "I take it from here".
[0] https://www.amazon.com/dp/0691134952