afraid to die?

[Schneed10]

I'm not religious, so I don't believe in an afterlife really. But there's so little we know about Neuroscience, that who the hell knows what goes on in your brain when you die.

If chemical imbalances can cause depression, bipolar disorder, and stuff like that, what happens chemically when our brains cease to get oxygen and carbon dioxide builds up? I mean, we know the brain tissue dies, but we don't know how the brain reacts to that chemical change. Does it release a signal making us think there's a white light? Does it release a signal feeling like endorphins? Hell, for all we know, a dying brain's chemical changes could release us into a vivid world that seems like heaven. For all we know, heaven could be inside our own minds.

That's what is so trippy, to me. We have no idea what our brain's going to do when we die. Will it do anything, and if so, how long will it last before the screen goes totally blank?