Crazy dreams? What they mean?

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I have some crazy realistic fantasy dreams... Yeah crazy already huh? Well you know how most people don't remember their dreams or if they do they only remember a few pieces or the weird parts of it? well i remember almost the whole dream and even the boring parts of the dream. sometimes i have dreams like from my past where it involves the present situations but the old area... its weird. sometimes hard to explain. Like the other day i dreamt of my home town and all the people from that time and the people from this time... mind you they are different for the most part... were all there. its like it changes certain things in my reality. But in the dream i couldn't hear what was going on just watching it like a silent film. Then at the end like the last few minutes i hear them talking about things that haven't happened to me. Sometimes its like the dreams get so real that im living it. Like i had a dream one time i was playing a virtual game. It was a zombie game where you were literally in the game and you had to find the safe zone and me and one other guy got to the safe zone but then he died and i had to find a new safe zone... Its weird. Any clues to why i have dreams like this? I can give a better example if you need. but why do some people have such vivid dreams and others don't?