Nothing happens. If you've ever been under anesthesia for an operation, when the operation may have lasted a couple of hrs, but you don't remember a thing, that's what death is like. As if those hrs were a minute, after going unconscious with nurses and docs all around you, hanging over you, you wake up with just a couple of people nearby disconnecting and wheeling you away. Except, in death, you never regain consciousness. Never come out from under. No dreaming. No nothing. That's death. Unimaginable. Not even a thought of darkness. Or, you go to heaven, strum a harp on a cloud, meet again all your past relatives and loved ones in charming replete and graze in the nourishing grass of God and Christ your savior. Jews, Muslims, et al need not apply.