He told her the town and the motel he was at, then looked down at his knuckles.

"I have to leave in the morning. Cas... he's healing and after that we're going to... figure this out. But I can't be alone right now. I just... can't. And I especially can't fall asleep right now like this."

If he fell asleep and Lucifer found him in his dreams... he could feel his strength slipping away and he couldn't let that happen.