He's shaking his head as soon as she finishes the sentence. Trying to sleep sounds like a death sentence right about now. If it works, it'll be fitful at best, and if it doesn't, he'll be alone in one place with all his thoughts - and right now, he can't think of much worse. "It's nearly morning. I'm fine."

Compared to some of his forty-eight-hours-without-sleep adventures, this is fine. Probably. Completely normal.

"I can entertain myself if you're tired." Since it's just occurred to him that being woken by someone else's night terrors probably wasn't her idea of a good time.