Emma & Jefferson~
This, of course, was the part they had to just wing. Emma had no clue how to get Jefferson to wake up, she was aware that she was dreaming, lucid dreaming but dreaming none the less, she figure that would assist in her ability to just wake up and leave the astral plane when she could.
But Jefferson was a completely different thing. How did he get his body back properly? And how could he wake up for sure and get off this plane of existence? "Um, just.... will yourself in, sit on it or something, mimic how your body is an just will yourself back in."
Mind over matter? She had to have seen a tv show at some point in time where it was just a case of thinking it and it happened. Maybe one of those cheesy sci-fi drama things that came on with the bad special effects or whatever. "I'll wake up when I need to, the... it's part of the ritual. You need to get awake now though."