シャドーイング練習: What would happen if you didn’t sleep? - Claudia Aguirre - YouTubeで英語スピーキングを学ぶ
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In 1965, 17-year-old high school student, Randy Gardner stayed awake for 264 hours.
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In 1965, 17-year-old high school student, Randy Gardner stayed awake for 264 hours.
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That's 11 days to see how he'd cope without sleep.
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On the second day, his eyes stopped focusing.
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Next, he lost the ability to identify objects by touch.
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By day three, Gardner was moody and uncoordinated.
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At the end of the experiment, he was struggling to concentrate, had trouble with short-term memory, became paranoid, and started hallucinating.
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Although Gardner recovered without long-term psychological or physical damage, for others, losing shuteye can result in hormonal imbalance, illness, and, in extreme cases, death.
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We're only beginning to understand why we sleep to begin with, but we do know it's essential.
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Adults need seven to eight hours of sleep a night, and adolescents need about ten.
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We grow sleepy due to signals from our body telling our brain we are tired, and signals from the environment telling us it's dark outside.
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The rise in sleep-inducing chemicals, like adenosine and melatonin, send us into a light doze that grows deeper, making our breathing and heart rate slow down and our muscles relax.
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This non-REM sleep is when DNA is repaired and our bodies replenish themselves for the day ahead.
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In the United States, it's estimated that 30% of adults and 66% of adolescents are regularly sleep-deprived.
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This isn't just a minor inconvenience.
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Staying awake can cause serious bodily harm.
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When we lose sleep, learning, memory, mood, and reaction time are affected.
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Sleeplessness may also cause inflammation, halluciations, high blood pressure, and it's even been linked to diabetes and obesity.
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In 2014, a devoted soccer fan died after staying awake for 48 hours to watch the World Cup.
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While his untimely death was due to a stroke, studies show that chronically sleeping fewer than six hours a night increases stroke risk by four and half times compared to those getting a consistent seven to eight hours of shuteye.
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For a handful of people on the planet who carry a rare inherited genetic mutation, sleeplessness is a daily reality.
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This condition, known as Fatal Familial Insomnia, places the body in a nightmarish state of wakefulness, forbidding it from entering the sanctuary of sleep.
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Within months or years, this progressively worsening condition leads to dementia and death.
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How can sleep deprivation cause such immense suffering?
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Scientists think the answer lies with the accumulation of waste prducts in the brain.
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During our waking hours, our cells are busy using up our day's energy sources, which get broken down into various byproducts, including adenosine.
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As adenosine builds up, it increases the urge to sleep, also known as sleep pressure.
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In fact, caffeine works by blocking adenosine's receptor pathways.
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Other waste products also build up in the brain, and if they're not cleared away, they collectively overload the brain and are thought to lead to the many negative symptoms of sleep deprivation.
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So, what's happening in our brain when we sleep to prevent this?
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Scientists found something called the glymphatic system, a clean-up mechanism that removes this buildup and is much more active when we're asleep.
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It works by using cerebrospinal fluid to flush away toxic byproducts that accumulate between cells.
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Lymphatic vessels, which serve as pathways for immune cells, have recently been discovered in the brain, and they may also play a role in clearing out the brain's daily waste products.
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While scientists continue exploring the restorative mechanisms behind sleep, we can be sure that slipping into slumber is a necessity if we want to maintain our health and our sanity.
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このレッスンについて
このレッスンでは、クレディア・アギーレが解説する「睡眠不足が引き起こす影響」について学びます。学習者は、持続的な睡眠不足が脳や身体に与える深刻な影響や、睡眠の重要性について考えながら、英語のリスニングと発音練習を行います。また、特定の英語のフレーズや語彙を取り入れ、効果的な英語の発音を向上させる方法を探ります。
主要な語彙とフレーズ
- 睡眠不足 (sleep deprivation)
- ホルモンバランス (hormonal imbalance)
- 短期記憶 (short-term memory)
- 妄想 (hallucination)
- 免疫細胞 (immune cells)
- 脳の老廃物 (waste products in the brain)
- グリムファティックシステム (glymphatic system)
- アデノシン (adenosine)
練習のコツ
このビデオは、適切なスピードで話しているため、shadowing練習に最適です。まずは、ビデオを何度も聴いて、語彙やフレーズに慣れましょう。次に、shadow speaksを積極的に行うことで、発音を改善し、自分の声を録音して確認することをお勧めします。英語の発音を良くするためには、自分の声とネイティブスピーカーの声を比較することが重要です。そのため、YouTubeで英語学習をする際には、音声に合わせて一緒に話すことを意識しましょう。ぜひ shadowing site を活用して、自分のペースで練習を続けてください。
シャドーイングとは？英語上達に効果的な理由
シャドーイング（Shadowing）は、もともとプロの通訳者養成プログラムで開発された言語学習法で、多言語習得者として知られるDr. Alexander Arguelles によって広く普及されました。方法はシンプルですが非常に効果的：ネイティブスピーカーの英語を聞きながら、1〜2秒の遅延で声に出してすぐに繰り返す——まるで「影（shadow）」のように話者を追いかけます。文法ドリルや受動的なリスニングと異なり、シャドーイングは脳と口の筋肉が同時にリアルタイムで英語を処理・再現することを強制します。研究により、発音精度、抑揚、リズム、連音、リスニング力、そして会話の流暢さが大幅に向上することが確認されています。IELTSスピーキング対策や自然な英語コミュニケーションを目指す方に特におすすめです。