Pratique du Shadowing: What would happen if you didn’t sleep? - Claudia Aguirre - Apprendre l'anglais à l'oral avec YouTube

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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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About This Lesson

In this lesson, learners will explore the fascinating topic of sleep deprivation through a video featuring Claudia Aguirre. You will practice your English speaking through the shadowing technique, where you imitate native speakers in tone, pace, and pronunciation. By focusing on the key concepts discussed in the video, such as the effects of sleep deprivation on the brain and body, you can enhance your vocabulary and improve your fluency, especially for IELTS speaking practice. This engaging content not only informs but also provides excellent material for developing your English speaking skills.

Key Vocabulary & Phrases

  • Sleep deprivation - The condition of not getting enough sleep, which can lead to various health issues.
  • Adenosine - A chemical in the brain that promotes sleepiness as it builds up.
  • Melatonin - A hormone that regulates sleep-wake cycles, increasing in response to darkness.
  • Glymphatic system - A system in the brain that helps remove waste products during sleep.
  • Fatal Familial Insomnia - A rare genetic disorder that prevents the body from entering sleep.
  • Inflammation - A response by the body to injury or infection that can worsen health issues.
  • Chronic sleep loss - The ongoing failure to get enough sleep, which can lead to serious health risks.
  • Emergency signals - Signals from the body indicating the need for sleep, such as changes in mood and concentration.

Practice Tips

To effectively enhance your English speaking practice using this video, focus on the following tips while applying the shadowing technique:

  • Listen carefully: Before you start shadowing, listen to a segment of the video multiple times. Pay attention to Claudia Aguirre’s intonation and pronunciation.
  • Start slow: Begin with slower segments to grasp the words and phrases clearly. Once comfortable, gradually increase the speed to match Claudia’s natural pacing.
  • Repeat and revise: After shadowing a segment, pause and repeat it a few more times. This will help reinforce your pronunciation and remember the vocabulary.
  • Use pauses: Don’t hesitate to pause the video if you need more time to practice. The goal is to make your speech fluid and natural, mirroring the style of the speaker.
  • Record yourself: To assess your progress, record your shadowing practice. Compare your pronunciation and rhythm to Claudia’s delivery to identify areas for improvement.
  • Supplement with IELTS speaking practice: Consider similar topics around health and sleep to practice spontaneously talking about these subjects, which can enhance your confidence in speaking exams.

Qu'est-ce que la technique du Shadowing ?

Le Shadowing est une technique d'apprentissage des langues fondée sur la science, développée à l'origine pour la formation des interprètes professionnels. Le principe est simple mais puissant : vous écoutez de l'anglais natif et le répétez immédiatement à voix haute — comme une ombre suivant le locuteur avec un décalage de 1 à 2 secondes. Les recherches montrent une amélioration significative de la précision de la prononciation, de l'intonation, du rythme, des liaisons, de la compréhension orale et de la fluidité.

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