Why do we have nightmares that would cause us I’m not always a bitch sometimes I’m asleep shirt to scream in the first place? At one level, the question is molecular in nature. Just like sleep-talking, nightmares can be correlated with physiological metrics. For instance, eating late at night can boost our metabolism and increase brain activity while you sleep. That increased activity correlates with more dreaming and more nightmares as a byproduct. But at another level, the question is about our evolution. Why would we have evolved to have nightmares? Evolution doesn’t always produce optimal results, so maybe bad dreams are just a weird artifact of our ancestry. But when you consider that some people can have such frequent, disturbing nightmares that they have issues sleeping, it seems suspicious that such an intense phenomenon didn’t serve any utility to our Neanderthal cousins.
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