C1340 語3:11ニュースレポートアメリカ英語2026年7月11日公開 · 2026年7月11日更新

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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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種類タグ、二言語の定義、使い方の説明、例文を含むフレーズ。

fight-or-flight response

technical term

A physiological reaction that occurs in response to a perceived harmful event, attack, or threat to survival.

闘争・逃走反応

解説： これは生物学と心理学の専門用語で、人間や動物が緊急の脅威に直面したとき、体が自動的に生理的な準備状態（心拍数の上昇、筋肉の緊張など）を整え、戦うか逃げるかを決定することを指します。

例： When the fire alarm went off, my body immediately went into a fight-or-flight response.

circadian processes

technical term

Biological processes that display an endogenous, entrainable oscillation of about 24 hours (related to the sleep-wake cycle).

概日リズム過程 / 体内時計のメカニズム

解説： 生物の体内で約24時間周期で起こる生理的変化のプロセスを指し、最も一般的なのは人間の睡眠と覚醒を制御する体内時計です。

例： Jet lag disrupts our circadian processes, making it difficult to sleep at the local time.

sleep deprivation

collocation

The condition of not having enough sleep; can be either chronic or acute.

睡眠不足、睡眠の剥奪

解説： これは非常に一般的な医学的・生活的なコロケーションで、長期的または短期的に十分な睡眠が取れていない状態を表します。単に 'not sleeping enough' と言うよりも、より正式的で専門的です。

例： Sustained sleep deprivation can lead to serious health issues, including high blood pressure.

surrender to sleep

idiom

To finally allow oneself to fall asleep, especially after trying to stay awake or struggling with insomnia.

睡魔に屈する、ついに眠りに落ちる

解説： これは文学的な色彩を持つ擬人化表現です。「睡眠」を征服者に例え、不眠症の人や疲れた人が最終的に「降伏」して眠りにつく様子を表します。文学作品や生き生きとした叙述でよく使われます。

例： After tossing and turning for hours, she finally surrendered to sleep just before dawn.

Why evolution doesn't want you to sleep when you're stressedストレスで眠れないのは進化のせい？

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