Maybe a combo since we both like playing multiple people.  It could either be random people that meet each other during the thing or maybe friends that have not seen each other in a long time or really whatever.  And I figure with this type of rp there would be the evil people that don't have the chambers because they want to learn to harness the nightmares they bring to life and cause chaos and destruction.  And maybe there are even people that are nulls that when they dream don't access whatever part of the mind that allows for the dreams to become real.  Maybe the reason that people a dreams started to be one real in the first place was because of some genetic shift that happened a few generations ago and with some people their genetic makeup doesn't have that gene.  I am just brainstorming here and saying whatever I think.  Feel free to add to or call bullshit on stuff if it makes no sense.  Lol.