When you have seen and heard a soul of a dead person move into and attach to another person, and communicate through their host’s voice, they have total memory recall of their own physical life experiences, but no physical body, you soon realize that memories are NOT STORED IN THE BRAIN.
BTW, I see dreams as your body’s memory storage defragging every night. And your mind sort of picks up random memories (and memories of thoughts/ideas) and builds a coherent (or less so) story from it.
That’s exactly what dreams are.
Communications from your own higher self.