The psychiatrist Carl Jung, who studied with and then broke away from Sigmund Freud, became one of the leading thinkers who believed that human behavior could be illuminated through astrology, archetypes of tarot, dream analysis and other new age disciplines. He wrote and illustrated a book which has been kept hidden away by his family for decades. Now it has just come to light and has been published. Jung's The Red Book stemmed from his "confrontation with the unconscious" during which visions came to him "in incessant streams".
According to Jung, dreaming offers a window to the psyche. There are plenty of symbolic meanings in your dreams that can be used to treat psychological problems. He wrote Memories, Dreams, Reflections and there are also plenty of great dream analysis sites out there if you want to try to interpret your own dreams. Jung added another element - the astrological chart analysis - to further help analyze ones psyche. For example: Where does Saturn the planet of problems lie in your natal horoscope chart? How does it interact with the other planet placements?