"Clue" is the right word. I've been blackout many times, but it is still so hard to imagine the lack of time. There's no imagination there so I'm not sure why I try so hard to imagine it. The way I can describe the concept in my mind is an eternal blip.
Ever been high on a big dose of mushrooms or DMT? This is what it's like when you die. Meaning, yeah science might show no brain activity moments after you're gone, but the moment your mind realizes you're dead, it injects these chemicals massively into the cells. In those moments, you enter the "afterlife", where these moments even if they last seconds seem like they are forever. This is where you end up, you're stuck in this next dimension, until you reappear as another life form. Serotonin distorts your reality for survival purposes. That is the main chemical that keeps us in this sort of realm. Of course other receptors influence it too but this is the main culprit.
Basically your spirit leaves your body into the next dimension and you get clued into your next realm of existence. Before you have no memory of your previous life, until you're reborn anew into whatever life your new ego manifests.
The old you is a distant memory of blackness, just a recorded moment in history, dust and a skeleton. That ego perceives nothing at all. No taste, smell, touch, no thoughts, no vision, no hearing.