when i'm awake, sometimes REALLY old dreams from when i was a little girl (i'm 13 now) just pop in my head. Dreams that i have forgotten a long time ago. They just pop in my head. Just randomly when i'm doing something i suddenly remember little pieces from the old dreams. I get this weird feeling like i'm IN the dream 'cause it feels SO real. And i can see in my head, pictures from the old dreams. it's almost like all my dreams are stored somewhere in my mind. what is this?