>>51944 (OP)
the body is built out of quickly decaying chemical compounds, every thought you have, every second that goes by, innumerable reactions store energy from the environment and release more back into it
every second that goes by part of you is replaced by something else
what truly happens is that we are probably part of something greater that flows in and out of our bodies and we perceive it as the passage of time, but only under exceptional circumstances are we able to keep memories of what we see when we're out of our body