That sounds so frightening to see, Amy. Maybe it really was just a bad dream, like Micki said. I know guinea pigs can get into such a panicked state that they will run into walls, but that's not really the same thing. I once saw a guinea pig at the vet that had broken its own jaw by running into a wall, and had to be put down because it couldn't eat.
I hope Smokey will be peaceful and happy for a long time yet. Maybe a lullaby before bedtime will help to stop the bad dreams.