I think dreams have something to do with our subconsciousness, thats why they aren´t very objective. So by analyzing them, I think they could show us how our subconscious is... you know.. our inner feelings, and desires, in other worlds, our true self. I think people are so used to "social protocols" and "codes of behavior" that they by spending so much time in forging lies and illusions, they doesn´t even know who they are anymore, and dreams can show us what we are truly feeling.