I definitely see my hobby dynos go to sleep. I don't try to get those sites indexed on search engines, tho, but (as you might be able to tell from my verbage),

I definitely see my hobby dynos go to sleep. I don't try to get those sites indexed on search engines, tho, but (as you might be able to tell from my verbage), I also don't do anything to keep them off. Still, they're asleep. Maybe there's a default robots.txt that tells them not to index, that can be served by a sleeping dyno?