Well, that was easy. She relaxes a little, taking another sip of juice and trying to figure out if this nightmare he's referring to is one she's been in. It's difficult to say, given how bad she usually is at remembering the shared dreams at all, especially without prompting. But it's not like she can ask him for details after he's explicitly said he had a miserable time - and not after explicitly asking him to respect her privacy. "Thanks," she says instead.

Then, in case it might offer some comfort, "I almost never remember the shared ones, anyway." So, an indirect admission that whatever his nightmare was, she either missed it or forgot it.