C1340 words3:11News Report American AccentPublished Jul 11, 2026 · Updated Jul 11, 2026

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Comprehension Vocabulary Shadowing Quiz Dictation Writing Practice

It is 2:13 in the morning, and you are utterly exhausted, yet your mind refuses to surrender to sleep.

Your eyes ache, your limbs feel leaden, and the impending alarm looms ominously, but racing thoughts commandeer your consciousness.

This paradoxical alert state, in which physical fatigue coexists with relentless mental activity, has become remarkably prevalent in modern society.

Researchers have emphasized that this phenomenon is not a malfunction but rather an adaptive response shaped by evolution over millennia.

The human stress response originally evolved to confront immediate physical threats such as predators or environmental hazards.

For most of human history, danger was both extreme and short-lived, demanding heightened vigilance rather than restful sleep.

Were a prehistoric human to fall asleep while a predator lurked nearby, the consequences would have been fatal.

The biological mechanism behind stress-induced wakefulness involves a brain region called the amygdala, which initiates the classic fight-or-flight response.

Upon detecting a perceived threat, the amygdala triggers the release of stress hormones, notably adrenaline and cortisol.

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These physiological changes include elevated heart rate, accelerated breathing, and sharpened attention.

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Energy is simultaneously diverted away from long-term maintenance functions, including the circadian processes that normally facilitate sleep.

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Scientists have cautioned that the core problem for contemporary humans lies in a fundamental mismatch between ancient biology and modern stressors.

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Unlike encounters with predators, today's sources of stress—financial pressures, workplace demands, and digital overstimulation—tend to be chronic rather than acute.

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Consequently, the stress response that was designed for brief emergencies now remains perpetually activated, producing sustained sleep deprivation.

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Not only does this undermine cognitive performance, but it also compromises immune function and emotional regulation over time.

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Experts have argued that understanding this evolutionary legacy is essential for developing effective interventions against chronic insomnia.

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Rather than viewing sleeplessness as a personal failing, individuals should recognize it as a deeply ingrained survival mechanism operating in an inappropriate context.

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Should society fail to address the root causes of modern stress, the epidemic of sleep deprivation is likely to intensify, with far-reaching consequences for public health worldwide.

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Why evolution doesn't want you to sleep when you're stressed

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