I sometimes can’t sleep due to stress or sickness. So I have a book on my nightstand for this situation.
It is a field guide to trees in my area. It is very boring and I’m not retaining much of what I read at 3:30 a.m. The point is to sit in a chair and look at trees until I feel I can fall asleep again.
I used to have a book about The Simpsons. It had a collection of jokes and it was very colorful and well illustrated. It helped me calm my anxiety induced insomnia by distracting my brain enough into mindless jokes (they were bad) to finally find sleep again.