We're overactive pattern seekers. A selective advantage - you can see why those who don't find meaning in sabre-tooth footprints are at a disadvantage to those who do.
Dreams have always been significant in human cultures, from those who believe them to be divine visions to those who base their whole creation myths on it. We've always inflated the importance of human attributes to the nature of the universe, and people find it difficult to believe that central aspects of the human experience are not very significant.
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