I know, I know I'm borrowing a title from a movie but I promise I don't do that very often so bear with me a little bit. Dreams, as you might have experienced are one of the most peculiar of human experiences that we can come across. Psychology says that these are manifestations of your inner desires, suppressions or even urges and wants; while spiritualism considers the psychological assumption but adds that dreams may also be a portal of communication between you and a world beyond this dimension.
Have you ever awoken in the middle of a dream and found yourself uttering words from the same scene? or perhaps sweating uncontrollably as a result of one? I have. It's amazing how an experience that is just in your head can trigger physical responses like speech and other mechanism. The reason being that the world as a fact of itself, exists to you only because you are able to understand it in your head. If there was a phenomenon that you couldn't calibrate with your mind, well then it wouldn't be a problem because you'd never notice it.
The thing is that to the best of my understanding the dream world is as unexplored as the nearest galaxy to our own, the milky way. We see it, we can feel the changes that it brings, we can even speculate and make theories about it; but no one really knows it's secrets because we don't even know if it's in the same time zone as ours. Well, light travels at a set speed right? and it gives us a look into the past for things that are very far away and beyond our reach; just like that you can't touch a dream but you can see it unfolding without being sure of the when and what. I know one thing though, sometimes I find myself in a moment that is an exact replica of the scene I saw in a dream perhaps months or years ago.