Her trailing off so much doesn't inspire a whole lot of confidence that she's going to keep standing... Papyrus fidgets but gently releases her shoulders, watchful for signs she's going to fall over.

"A lot of sleep? Were you... asleep for everything, just now?" He's hopeful as he asks, because that'd be a lot better than her feeling or remembering any of it.

If Sans felt anything like this after rescuing Papyrus from that nightmare, no wonder he'd seemed such a wreck. Wowie.