The dreams that originate with the physical body are for your functioning and survival in the world of physical nature. They deal with your physical and psychological well being. These dreams are like your manager and janitor who try to keep body and mind tidy for your general well being.
Then, there are those dreams that have a mystical and special characteristic to them which are for your spiritual development and progress. They produce instant knowledge and information that is beyond your ability to garner through intellectual or logical means.
Read : How to interpret your Dreams