sleeping

Sometimes, when I am sleeping, if it is a very deep and dark sleep, I dream things: like: that I am running, down long hallways without end, through half-open doors, around corners. I gather speed. I build momentum. Am I chasing? Or being chased? I do not know. I see shadows. I see things that appear and disappear. I run. I can feel my paws, running, I feel the air and my speed. I seem to be going somewhere, toward something or away from something, I do not know. When I open my eyes I can only remember the sensation of moving, very fast, my breath coming fast, my heart beating fast. Sometimes I open my eyes and my paws are still moving. Sometimes when I awake I am still afraid, of what I do not know.