We can't comprehend nothingness. We picture nothing as pure dark, or pure white. Devoid of everything, but the fact is our mind is filling nothingness with some sort of feature in order to visualize it, and you can't visualize nothing because it isn't there.
Can't visualize death, because we perceive ourselves as unmoving, unfeeling, inaudiable, etc etc etc in the blackest of black, but the simple fact that our perception of all that still exists means we have incorrectly visualized nothingness.
To which I wonder if nothingness can even be accomplished. You cannot have a devoid area. That area has an end barrier to contain all that nothingness, meaning nothingness is contained, and is therefore something.
Even if nothingness is limitless, you could have to move around within it to be sure. Meaning nothingness at the very least has an xyz axis for you to move around and look in. What's more, nothingness can't be infinite, because it would either: Collide with reality, and is contained, or you would eventually, through sheer luck, stumble upon reality, meaning nothingness is a container.
Therefore, I have to conclude reality is simply what we perceive. When we die, we continue to exist with every possible perception, including self awareness, shut off. As we know energy cannot be destroyed, self-awareness is simply having enough energy to be alive, or functional. As our energy rots away in caskets, or a hole in the ground, our atoms are slowly split up between the ground, earthworms, floods, magma, everything that makes us, well us is divided up amongst the earth.
After that, there is an infinitely implausible chance that one day, these atoms will come together through bacterial infection in the uterus and sperm banks, and we may have a chance at being turned on once again. Assuming the earth doesn't explode and our atoms fired across the universe.