The Walking Dead

According to an expert (it's a sign of the times, that the word expert always seems to carry an implied, "so called," in front of it) human decomposition begins within 4 minutes of biological death. Doesn't that seem like a razor thin margin? Aren't you going to worry the next time you have trouble waking up, or you get an infected cut, that your body knows something you don't? On the other hand, if you really have trouble waking up, hit the snooze button. Given another ten minutes, you may not have to go to work.