I'm not sure. I did get into a pretty bad car accident almost a year ago (Dec. 20, to be exact), so I'm thinking maybe that has something to do with it, although in the dream I drive into a wall and in reality, I lost control in the rain and rolled over. (Crazy story, too - neither of us in the car were even injured! But man, was that scary).
It might also have to do with control issues. I can't stand not having control, and I guess I've always had an innate fear of not controlling every aspect of my life.
Hm. Despite the whole scary thing, looking back, it was sort of interesting and almost cool. o_o