Mulder watches her shift and stretch out, knowing that this is a ploy to get him into the other room - and knowing, too, that it's going to work. She doesn't run the way he does, endlessly to the point of exhaustion (and sometimes beyond). He can't ask her to sit up with him until the sun rises.

"Why don't you sleep, Scully," he says. When he stands, there's a slight creak, like a tree in strong wind. The mugs, he leaves on the coffee table, but when he passes her, he pauses, running a hand lightly along her hair. "Don't worry about me."