I wounder if there has ever been any serious attempts at people trying to link in there dreams, in a dream research instatute or something. Some times when a DC is bugging me, I will calmly look it in the eyes and tell it that it isn't real and that it is just a part of my mind. Usually is gets mad and turns into like a berserk half demonic version of its self. Kind of messy but interesting, andthat is probably a pretty sure sign that it isnt another dreamer, but thats just my mind, and it was only a couple of times.