So, my DH has a habit of trying to have sex with me when he's asleep. He doesn't seem like he's asleep - I even ask him if he's awake and he always says yes. Well, sometimes he is awake, but sometimes it turns out he's actually asleep and he wakes up halfway through or even at the end 
Then he acts like I've been interfering with him and I think he feels uncomfortable/embarrased about it.
So AIBU to assume he's awake if he's climbing on top of me etc?