^^ DNA holds consciousness? Hmm...not sure of that, but I think I see your point.
Here's another thought: isn't it better to think there is something after death, something that isn't absolute nonexistence? Your thinking doesn't have to be religious at all, though of course it requires a bit of faith in something, if only the survival of your conscious essence after death.
If you think there is something after death, you can spend some time preparing for it, so you can make the most of the transition (i.e., sleep yoga). Even if it's nothing like what you were expecting, at least you'll be ready for something(and yes, I have a feeling those who are confident in a biblical heaven and hell are in for a surprise).
On the other hand, if you are confident that your existence will be nullified upon corporeal death, if there is an "afterlife" then you might be extremely confused by the transition to it or, worse, you might allow that nonexistence to occur because it is what you expected. It won't actually be a nonexistence, but just the feeling of it; by your own choice you will be existing in a void forever, because that is what you thought it would be.
To me it does not harm to imagine an existence after death. After all, if there really is nothing, you will not be there to know you screwed up, right? And if there is something, well, your imagination might help prepare you to better cope adjust to your new life.
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