Cmv: there is no scientific reason to believe that all there is is nothingness after i die.:
Neuroscientists have studied the brain extensively and not found anything resembling a 'center of consciousness' in the brain which actually causes our consciousness.

This begs the question: external source of consciousness or internal source of consciousness?

We could just as easily be a host for consciousness which has an external source, as we could be just a random accidental chemical self-awareness.

Just because fiddling with the brain fiddles with perception does not mean that our consciousness is sourced in the brain for the same reason that breaking your speakers does not mean the livestream you're watching went silent.

So we really have no scientific reason to believe that we will just go to sleep and never wake up, but it philosophically makes sense in a universe with so many cyclical systems that we are just reborn. You dont have to believe in rebirth but there is no scientific basis for either external or internal consciousness and no scientific basis for the belief that death is just a black abyss.