Dreams about constant motion?

I have dreams, both daydreams and REM dreams (for lack of a better description), about being in a constant motion that I can't stop. Usually they're like jumping rope, over and over, and as much as I want to, I can't get myself to stop, and I'm not tired. Also, I've had ones where I'm running either in an open meadow-like space where cliffs keep forming in front of me and I have to jump, or I'm running down constant corridors. There's nobody in my dreams other than me, and most of the time they're in the third person, but sometimes they're in the first person. Any ideas on what they mean?