Once unconscious all systems will operate as well as they can until oxygen deprivation depletion occurs. I have been there and almost bled to death from internal problems. I felt nothing as hypovolemic shock took hold. They said I was convulsing, but I felt nothing. Human biosystems seem to be set up to provide stability to the body, however when any part of the process is sufficiently interrupted, death tends to occur. Love and hugs to you.