R is for Running in Slow Motion in Dreams

I remember as a kid I had these dreams. I was chased by kids bigger and badder than me. Try as I might, I could not run faster than running in slow motion. It was very similar to a lucid dream (scroll back to L is for Lucid Dream) where I was awake in my dream. 
The major difference was that I could not make a conscious effort to run faster and escape. Maybe this falls in the category of a nightmare; awake in the middle of a dream with imminent danger but not having the ability to change...