If your consciousness shuts off under anesthesia and then turns back on, is it still you? If your brain fully cuts off consciousness for a bit—maybe down to the microtubule level or whatever—then starts it up again, is that still the same "me" I've been for many years? Or has the original me been replaced by a fresh instance every time, and I just don't notice? Do doctors kill their patients (or their stream of consciousness) every time they induce anesthesia?