Have you ever had the dream in which you're late to a final exam, running around trying to find the classroom where it's being given, only to realize that you've never gone to class even once all semester and it's too late to drop? I guess that can be interpreted to mean there's anxiety (real or imagined) over not being prepared for something.
Whenever we are getting ready to travel, I start having variations of the same nightmare -- we've missed our flight or forgotten to pack something important, like passports, tickets, or a camera. Or something unforseen happens to throw a wrench in things. Oh wait, that wasn't a dream... a few years ago we really were hit by an uninsured driver the day before a trip and had to rent a van so that we could still go.
Or even worse, like Clark Griswold, we finally arrive at our destination only to find out that the place we drove all this way to get to is CLOSED FOR REPAIRS...