You gently wake her, and reminder about all of the times YOU were sound asleep, and she felt not one single bit of guilt, or remorse about waking you up at some ungodly hour, when she knew you had a long day behind you, and a longer one in front of you, because she was horny and couldn't sleep, and needed to cum.
Then settle for the quick blow job she hopefully offers you, or hope she gives you permission to fuck a sleeping hole, as long as you can be quick about it.