This is my theory: You die, nothing happens, just like you are asleep. But you know the way life just randomly appeared on earth? Well there has got to be in a random time maybe in like 20000 billion years that something will happen to your body or brain, you could be a human again, or even a dog. Or even scientists after a few years found a way to revive people. So basically you won't even remember the blackness of nothing happening, you will be unconscious for a while and sometime you will be conscious again.