It's funny, but I use MST3k to help me go to sleep. Perhaps not the most flattering of statements that can be made about the show, but it helps me relax enough that I nod off about 15-25 minutes in.
Ditto. Something relaxing about it. It used to happen to my Uncle also. He loves MST3K, but whenever we put one on, around 6 pm, we'd be out in about 10 minutes. Same reason. Just comforting. But with him it's unusually strange because he could be talking to you while he was tired, and then 20 seconds later, after you've paused for a thought or something, he'd be out cold. Hilarious.