I believe that our subconcious mind can figure out things and notices things more than our concious mind. So when we dream, since our subconcious mind cant just "tell" us what it knows it has to use pictures and scenerios to pass the message across to us and to help us sort it out. However, most of it is lost because it is just considered "random images" when it is probably a hidden message. Thats why I love dream interpretation so much and why I am so interested in dreams.