I think you're blurring the line between dreams and memories.

When you LD yourself into your kindegarden classroom, for example, and make your body into that of a child, you're still having a dream. So if in the middle of the dream a gunman runs in and starts shooting, it doesn't mean that happened in real life when you were six. Just like a non-lucid dream, except you'd be even better off cause you'd have the control to get rid of outside forces that you don't want present in the dream.