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What do you mean when you say you can't think about it rationally? There are enough survivable experiences physiologically similar to deathThat makes no sense. There are some experiences of coming close to death, or what doctors consider death -- which is the mind/organs shutting down, etc.
There is (and can't be) no experience of actual permanent death though, nor has a dead person recounted their experience while a dead person.
The ones retelling the experience are always alive when they do it.