what is dream? why its coming during sleep?

I do have my own theory of ?Dream? which is the ´chaotic memory´ of the universe, that encountered with your mind, on a certain level of the frequency. So, the information that the person get in their dream, is not always about the ´dreamer´. It could come from an actualy event that already or will be happening on the other people or even on the other side of the earth... This theory I wrote down to one of my blog, called http://dejavu-cases.blogspot.com

my professor in psychology said that you have dreams because of your unconscious wants... you can even tell yourself what you want to dream before you go to bed..=) hahahaha. having dreams isn't bad... hehehe, its really amusing coz a lot happens in your dreams that normally doesnt happen when you're awake..=) i normally have dreams about my friends, and the people i fell in love with before but never worked. grr. hahaha.