Life is complicated. Despite how automatic the process is, the amount of biological perfection goes into creating a living, breathing, functional organism is insane. Even acts as simple as breathing or having your heartbeat, two functions that are entirely automatic, require several different components of your body to be in perfect synchronization. This means that several messages must be constantly going from your brain down to your body at all times, and then going back up to regulate it. Have you ever stopped to think about how complex these processes are? Or how difficult it is to stop these processes on your own? You cannot simply will your heart into no longer beating.