Dreamless sleep was not an option, not when he needed his mind one hundred percent, any nightmares and all. Barty had to wake up and help Evan if he had any more nightmares. And while Barty disliked that they upset Evan, they seemed to - perhaps - have pieces of memories. And that was a good thing. "I'll do without it," Barty replied easily. There was no debate.
"You'll be the only one to be able to come through the Floo here," Barty warned. Otherwise it was extra crunchy time for them. "I'll give you the mirror in the morning. It sounds good." And if anything spontaneous did happen they didn't have to worry about Theo. Barty wouldn't have except that he figured innocent Evan would. Oh his thoughts shouldn't have gone down that path. It wasn't going to happen.