Alrighty, I have a few general questions for a variety of things that might come up. c:

Will characters know whose dreams they're in somehow or will they need to figure it out? This sort of ties in with the next question, which is if the host character needs to actually be in the dream themselves or if parts/all of the dreams can be solo adventures (in this case I'd guess the host would experience the dream through the visitor's eyes/actions.) Similarly, if both the visitor and host are present, can they work together/influence things as a team?