I think it's pretty clear we have physical consciousness, if for no other reason than witnessing the effect of physical changes to the brain.
For that reason I feel the framing of the question is wrong, rather than trying to prove the lack of afterlife the burden should be on affirmatively proving the existence. Why on earth would you think there is one? The only reason seems to be cultural memory of superstition from when we as a society had far less ability to explain the world.
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