Sure enough, Klaus sleeps for just over an hour before he's waking up with a start, sweating cold bullets and snapping himself up to sit in a way that makes him wince the moment that he remembers he isn't alone.

"Shit," he mutters quietly, bringing a shaking hand to rub over his forehead and trying to calm down his breathing so he can focus enough to figure out whether he's managed to disturb Five or if his brother is so deep in fever-sleep that he's stayed asleep. He's hopeful for the former, selfishly, even if the latter is what would be better for Five.