Papyrus doesn't repeat the hysterical laughter at the joke, but he chuckles and leans a little harder against the doorway as his arm jerks. It's funny, because Sans is always napping, skeleton or human. It's funny because Papyrus is exhausted now, and maybe it's because he didn't amass naps all those years to have in storage now. Or maybe it's all the electrocution! But he manages to tune in again for the followup question, and think.

"I... stood up," he says like it's agreement, but he stares down at his legs uncertainly. Even now that he's out here, he's not entirely sure how he got out here. All of him wants to be lying in bed, shivering or twitching or whatever this is, except for his mind. His mind does not want to be in that bed, in an empty house. No wonder he got out here, somehow. (Aches on his legs suggest, he didn't walk most of the way.)