Yeah, counting sheep is a no go for me too. For me, the worst insomnia days were unruly toddler/small child days until I recalled Papa's solution. Take your Urchling opossum hunting. And don't forget the bread bag. Very important. Works wonders. Now, I walk the dog several miles in the evening. I don't listen to audio books though, too dangerous where I'm at.

Brain Plague by Joan Slonczewski is a good on if you like Sci-Fi.