I agree that it's in the genetics. I don't mean that to be offensive in any way. My husband is not selfish in the least, but his hands wander in his sleep, he's not even aware of it. He sees it as great sign of affection and compliment that he "still can't keep his hands off me after all these years." There have been times, when I've had sleep issues that he has woke me up without knowing it and I've been annoyed, but then perhaps he doesn't enjoy my ice cold feet between his legs in the winter either.