Why do I keep having deja vu experiences from my dreams?

I experience deja vu alot. After thinking long and hard about whether I had gone through the situation before (to see if it really wasn't deja vu, just a memory), I realize that this could not possibly have happened before and the reason for deja vu was because I had a VERY similar dream to it. So, what is really going on is that I am dreaming up situations before they happen. This doesn't just happen occasionally, it occurs so often that I find it hard to separate actual events in my life from dreams. This rose up several questions in my head. Why are my dreams so lifelike and vivid (nothing seemingly unreal or fantasy-like about them)? Is there something my subconscious is trying to tell me in my sleep? Why are my dreams creating a lot of deja vu? Weird, huh? Any explanations?