Dream

Lets think why people dreams. Why it happend only when we sleep? How work mechanism which determine when you will dream? Its easy, by physical meaning, there are several phases of sleep, during which is brain in different states. And one of them is called REM (by Rapid Eye Moving) when your eyes moves rapidly, and thats time when you dream something. And also its time when you rest best, when there is dysfunction, and you cant reach REM sleeping it will damage psychic and you can go mad.