a good friend who studied law and psychology told me once that long term memories are formed during rem sleep, and that many memory disorders, including amnesia are closely linked to sleep disorders of some sort.
his theory was that if you die, say in the afternoon, the memory of your morning activities on the day of your death could not linger into any sort of eternal afterlife. he claimed it was physiologically impossible, you just wouldn't remember the events of your final day. if, on the other hand, you died in your sleep early in the morning, after a night of dreaming and storing long term memories of your final day, then they would accompany you in eternity.
but i like your theory better, because you are saying that there is only a perceptual eternity; relative to any clock observed by those still living, what you perceive as eternal peace or eternal suffering occurs within the space of a few minutes as life is fading from your body and it returns to dust. if this is true, then both long and short term memories would be a part of what you experiences "after death," or during death.
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