The tempting follow-up is; do you know what it is?

It's a waste of breath to ask it, though. If she knew what it was, she would have told him by now. Han has no doubt of that. Nor would it upset her as much as it seems to, if she had some idea of what she was dealing with - he's pretty sure that Rey has the resolve to get through nearly anything.

"It's always because of a bad dream?" He says as he reaches for Rey's hand. "Or have you moved things when you were awake?"