I have this too, I have like positive and negative me chatting away to eachother all the time over the stupidest of things ( say If Im tired and want to lay down one me is calling me a lazy ***** and the other me is saying I shouldnt feel bad about it ) my Husband will sometimes catch me doing it and ask what am I thinking about. I also have a permanant'Jukebox' playing which really drives me mad as it's usually songs set off by words or phrases and the song will stick until something triggers another one. Makes it very hard to fall asleep