I always read before bed, sometimes it's the first quiet time in the day where I've been able to pull out my eBook to read. I never fall asleep reading, but after reading the same paragraph 3 or 4 times in a row and still not remembering what it said I know it's time to turn off my eBook Reader, roll over and wake up Hubby so he can turn his off, and go to sleep.
I never listen to Audiobooks at bedtime anymore, I'm always asleep within 10 min and then can't find my place in the story the next day. Maybe it's a hold over from being read to at bedtime when I was a child. Hearing story being read = sleep time. In any case it works better than counting sheep.