To sleepwalk is to be inhabited, yes, but not by something else, so much. What you’re inhabited by, what’s kicking one foot in front of the other, it’s yourself. It doesn’t make sense, but I don’t think it’s under any real compulsion to, finally. If anything, being inhabited by yourself like that, what it tells you is that there’s a real you squirming down inside you, trying all through the day to pull up to the surface, look out. But it can only get that done when your defenses are down. When you’re sleeping.