If you get your throat slit, you won't fall asleep in two seconds and you won't die in five seconds. You will bleed out. You will also experience extreme pain as the sensitive nerves in your neck are penetrated with metal. It's the same for animals. I don't know if you made that up, or if someone told you that, but that is a very naive thing to believe. Islam does not change with science, it is dogmatic. You are so misled!