Dreaming about running is not actually running, is it? When we dream, as when we think more generally, we usually don't do much of anything in the physical world. In both East and West we find philosophical traditions that hold that our mind is in fact something very different from our brain and the rest of our body. Minds, in these traditions, are detachable from bodies, immortal, and only temporarily occupy bodies for the duration of an individual's life. These traditions have been very popular through history. There are, however, other traditions. In both East and West some philosophers have held that the mind is but a part of the body, and that like the body, it is physical and works like other physical things. It is this latter view (let's call it a physicalist worldview), that has become popular with the emergence of modern neurology and neuroscience.