I wouldn't call it imperceptible. Nor would I say it stands for death, but who knows, maybe some multiples are like that, just like some people. You only need a few to end it all. It sounds more like staying alive is an incredible struggle and therefore not even worth fighting for. A lazy person would certainly not do so, nor would a tired person. The same applies to depressed and listless people, so there is not much left to fight for a future and therefore life.