I sleep on my stomach with my head under a bunch of pillows so if someone wants to come in and try to kill me they can't tell if I'm there or not, so they'll just leave.
I don't know why, it's the same reason why you like some music and you don't like others. There's something about it that you like. Ultimately I don't find it's in my best interests to try and analyze it, since it's fundamentally emotional.

