I've been thinking what it feels like to die is the whole process of your brain shutting down. My hypothesis is that as your brain cells start to die, some die

I've been thinking what it feels like to die is the whole process of your brain shutting down. My hypothesis is that as your brain cells start to die, some die before others. I wonder if the process of dieing is experienced in hallucinations as the self experiences more and more cell death. Then at some point, the cells that do the experiencing and that give you a sense of self vs other slowly die and you lose your ability to distinguish yourself from the rest of your experience. This, I imagine, is what it feels to be "one with the universe".