Why evolution doesn't want you to sleep when you're stressed
Listen to Course
0:00
0:00
#1
It is 2:13 in the morning, and you are utterly exhausted, yet your mind refuses to surrender to sleep.
現在是凌晨兩點十三分，你已經筋疲力盡，然而你的大腦卻拒絕向睡眠妥協。
#2
Your eyes ache, your limbs feel leaden, and the impending alarm looms ominously, but racing thoughts commandeer your consciousness.
你的雙眼酸澀，四肢沉重如鉛，逼近的鬧鐘陰森地步步逼近，但奔騰的思緒卻強行霸佔了你的意識。
#3
This paradoxical alert state, in which physical fatigue coexists with relentless mental activity, has become remarkably prevalent in modern society.
這種矛盾的警覺狀態——其中身體的疲憊與不停歇的大腦活動並存——在現代社會中已變得極為普遍。
#4
Researchers have emphasized that this phenomenon is not a malfunction but rather an adaptive response shaped by evolution over millennia.
研究人員強調，這種現象並非功能失調，而是經歷數千年演化所塑造出的一種適應性反應。
#5
The human stress response originally evolved to confront immediate physical threats such as predators or environmental hazards.
人類的壓力反應最初是為了應對即時的身體威脅（例如掠食者或環境危害）而演化出來的。
#6
For most of human history, danger was both extreme and short-lived, demanding heightened vigilance rather than restful sleep.
在人類歷史的大部分時間裡，危險既極端又短暫，需要高度的警惕，而不是安穩的睡眠。
#7
Were a prehistoric human to fall asleep while a predator lurked nearby, the consequences would have been fatal.
如果史前人類在掠食者潛伏在附近時入睡，其後果將是致命的。
#8
The biological mechanism behind stress-induced wakefulness involves a brain region called the amygdala, which initiates the classic fight-or-flight response.
壓力引發的覺醒背後的生物學機制涉及一個名為杏仁核的大腦區域，它會引發經典的「戰或逃」反應。
#9
Upon detecting a perceived threat, the amygdala triggers the release of stress hormones, notably adrenaline and cortisol.
一旦偵測到感知的威脅，杏仁核就會觸發壓力荷爾蒙的釋放，特別是腎上腺素和皮質醇。
#10
These physiological changes include elevated heart rate, accelerated breathing, and sharpened attention.
這些生理變化包括心率加快、呼吸急促以及注意力集中。
#11
Energy is simultaneously diverted away from long-term maintenance functions, including the circadian processes that normally facilitate sleep.
能量同時被從長期維護功能中轉移出去，其中包括通常有助於睡眠的晝夜節律過程。
#12
Scientists have cautioned that the core problem for contemporary humans lies in a fundamental mismatch between ancient biology and modern stressors.
科學家警告，現代人的核心問題在於古代生物機制與現代壓力源之間的根本失衡。
#13
Unlike encounters with predators, today's sources of stress—financial pressures, workplace demands, and digital overstimulation—tend to be chronic rather than acute.
與面對掠食者不同，當今的壓力來源——財務壓力、工作場所需求以及數位過度刺激——往往是慢性的，而非急性的。
#14
Consequently, the stress response that was designed for brief emergencies now remains perpetually activated, producing sustained sleep deprivation.
因此，原本為了應對短暫緊急情況而設計的壓力反應，現在卻持續處於啟動狀態，進而導致長期的睡眠剝奪。
#15
Not only does this undermine cognitive performance, but it also compromises immune function and emotional regulation over time.
這不僅損害了認知表現，而且隨著時間的推移，還會損害免疫功能和情緒調節。
#16
Experts have argued that understanding this evolutionary legacy is essential for developing effective interventions against chronic insomnia.
專家們指出，理解這種演化遺留下來的產物，對於制定針對慢性失眠的有效干預措施至關重要。
#17
Rather than viewing sleeplessness as a personal failing, individuals should recognize it as a deeply ingrained survival mechanism operating in an inappropriate context.
與其將失眠視為個人的失敗，人們更應該將其視為一種在不當情境下運作、根深蒂固的生存機制。
#18
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.
若社會未能解決現代壓力的根本原因，睡眠不足的流行病恐將加劇，並對全球公共衛生帶來深遠的後果。