I was just thinking the other day, that wouldn't shared dreaming have to be an alternate universe or realm or whatever you want to call it.
I personally think shared dreaming is real, although I have no personal experience with it, but wheather it is or not doesn't really matter. If you don't believe it than "pretend" that it is real for a second. From what we know, dreams goes on in our brains, but if two people could share a dream what would that make it? Would it be a shared mind or what?
Anyway, just leave your oppinion or comments on the subject.