Jack tenses for a moment, unsure just what to do. He doesn't want to wake her, but he's not sure how he feels about her falling asleep on his shoulder either. It's not something he's entirely comfortable with, and not just for the reason of personal space, either.

But then the least he can do is let her sleep, though with his nightmares, he's not sure following her lead is a good idea. Leaning his head against the back of the couch, Jack closes his eyes and concentrates on the sound of her even breathing to try and relax.