you realize how nonsense and bonkers that all sounds, right? You cant KNOW anything like that.
Not a concious afterlife, no. Our matter, literally the unliving atoms that form the non living parts of our bodies, decays. I believe the energy that flows through us is released back into the world, to become all the forms of energy we came from, kinetic, light, sound. The vast amount of energy that was once us spreads out, possibly holding tiny tiny remnants of who we once were, shredded and scatterred into bits no longer a whole. I believe when you die, your energy will spread back out and become sound, light, kinetic energy, shifting and warping constantly, until fragments of it is adopted into a new living being that requires that "Life Energy" To come into living and existance. Deja Vu? I believe that is when a small nugget of energy, still vaguely imprinted with a speck of memory is triggered by a stimuli it recognizes. Ghosts are similar. I think ghosts are residual energy excessively radiated by living beings in times of intense emotion. So when people see ghosts, its just an inherant sensitivity to wafting clouds of remnant energy charged with an emotional imprint. But one day, one tiny fragment that was once you will be a piece of another living being....but just...one infinitely tiny little fragment. I look forward to being the bass that kicks for a moment, the kinetic energy as it floes through you. I would be far more beneficial as energy than i am trapped in this...Meat Sack.
Simply put, imagine blowing up a balloon and then popping it. Now try to get EXACTLY the same molecules of air, in the same quantity into a new balloon. You literally cant. But a couple of those molecules might end up in that new balloon. And the simplest law of existance....Energy and Matter cannot be created or destroyed, only changed.