A 6yr olds imagination

I was putting the boys to bed (Halloween) and M starts telling me that their is such thing as "dreamies". Apparently they are "little me's" that we all have. He tells me that they come out when we are sleeping and go to buffets. Also he says, "It is very rare for them to actually talk to you. I have never had one talk to me. And when they get crabby they have wars."