I've had those dreams. It's so aggravating, because in those dreams, every time I think it's safe and stop running, another zombie lunges at me and I have to keep running.

For me, it seems to be a metaphor of how I'm always trying to keep up, but failing. Whenever I try to relax, I can't, because I haven't succeeded in escaping the zombies. I have to keep running when all I want to do is relax and feel confident that I'm doing what I'm supposed to do.

It seems to be one of the metaphors for zombie movies, BTW, to keep running, keep up with changes. Every time people settle in one place, the zombies manage to get in. The metaphor seems to mean you have to keep up with changes in life, and if you can't keep up, the zombies will get you.