Random Thoughts

Why do people dream?

We all are curious on why we dream. Whenever we go to sleep there is this thing or place in were we imagine things that are surreal. But why so? Is it part of a memory in the past? Or a way of seeing the future? Some people often don't dream, which is weird since almost everyone dream. How and why though? There are also people having nightmares. Also how and why? Is it because of stress? Something bad is about to happen? Or your mind playing tricks? Even some people dreams became real in somewhat, as they call it "deja vu". But how? Is it a way to tell that our dreams is a sight of whats in the future? Or maybe you imagining things? Who even discovered the word "dream/s", "nightmare/s", and "deja vu"? And when did we start using those words? We may never know...