I don't know. And I'm comfortable in the thought that those who claim they know don't know either.
But if I had to give an answer, I'd quote Epicurus : "death is nothing to us." When we exist death is not, and when death exists we are not. All sensation and consciousness ends with death and therefore in death there is neither pleasure nor pain. The fear of death arises from the belief that in death there is awareness.
Non fui, fui, non sum, non curo (I was not; I was; I am not; I do not care)
For having witnessed the death of some of my close relative, I'd say that there is peace in death. The sadness is for the others, not the dead.
I try to live a good life and I know it's going to end one day. I try my hardest for when that day comes, I will not look back on a life of missed opportunity and regrets. That's the only thing an humble man can hope for.