Well time travel existed outside of crazy mothers of slayers deciding to mess with her head as a kid. Faith had just kind of figured that had been a ghostly possession kind of thing. And she hadn't exactly fought it since Alex being around as he playmate had kept her from being a total waste of skin later on in life.
"I don't exactly pick when to go walking around in people's dreams. It's happened a bunch but kind of under really super out there circumstances. Like being in a coma. Or dying. I don't know if it'll happen again." Buffy and Angel had got to have her helping them out in her head. Faith hadn't liked either of the dreams with B but she was glad she'd seen Angel's dreams.
"So who's your brother? And why would I be playing night time peekaboo with his head?"