Originally Posted by Soldat of life

I found this link: http://en.wikipedia.org/wiki/Sensory_deprivation

Though I'd say dreams is the part that keeps your brain working while you are uncounscious. Awake, everything around you keeps you busy, including yourself. But while you sleep, you don't have your senses to keep your brain busy. So dreams exist probably to keep you alive and if you remember them, well its not always clear what the dream may be as its not an exact copy of your life in the way your conciousness may see it...I'll stop here before I go too far off in my thoughts, But I hope this helped.