Yes, I wake up with a hard-on twice a night...and I usually have to piss or do something or it won't go away and I can't sleep.
When I was in college, I roomed with a good straight friend of mine. We had bunk beds, because we shared a tiny room...I was on top, and I'd wake up each morning with my sheets shaped like a teepee, and my friend just loved to make a comment about it, but he knew there was nothing I could do. Some mornings he'd whip my sheets off while I was sleeping and there I would be, with a raging hard on, trying to hide it from him.
So, for a while, I slept without underwear and it would really make a lump in the sheets, and still he'd whip them off as a joke. (I think he just liked seeing a big dick once in a while!) Needless to say, I loved this game, because I was the gayer one, and would have loved to jump into bed with him!