쉐도잉 연습: Why Do We Actually Need Sleep?? - 영상으로 영어 말하기 배우기

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Sleeping.

Every day you go to your bed, lie down and do nothing.

For like eight hours.

This is stupid.

The time you spend doing literally nothing could be spent on so many other things.

Like eating, drinking, exercise, getting a job, spending time remembering that time you accidentally called your teacher mum.

But instead you're doing this.

Why?

Why haven't we figured out a way to not need to do this?

What does sleep even do?

And why do you feel sleepy?

What is sleepy?

Two things.

First is the suprachiasmatic nucleus, which is just your body clock.

It relies on light to get an idea of what time it is.

When it's day, it's chillin'.

But when it becomes night though, your retinas in your eyes see this

and then send messages to your body clock and it goes.. bed and then allows the release of melatonin,

which pretty much tells the brain it's nighttime.

And second is adenosine.

The heck is that?

Well all of your cells use this thing called ATP as energy, but as your body uses it, adenosine accumulates.

This accumulation increases sleep pressure, which makes you more tired.

So you finally climb into your bed and then you just lie there?

Don't worry, even

Even though you might feel like you're just lying there like a useless blob,

your part of the brain called the hypothalamus is getting ready to send

you into your dreamy state where you ride unicorns and eat fluffy clouds.

During the day, your brain is constantly sending messages using all these different chemicals in your brain called neurotransmitters,

but it's being extra sure to use these special neurotransmitters to stay awake.

But as your sleepiness builds,

it gets to a point where it lets this thing out of the cage the ventrolateral preoptic area inside the hypothalamus,

or VELPO for short.

What this does is blocks all the systems in the brain

that are making sure that it's using these neurotransmitters to stay awake, and thus gets you to fall asleep.

So now you're sleeping like a baby.

But again, why have we even evolved to need this absolute waste of time?

We'll get to that.

But first, what's happening while you're asleep?

It's called the sleep cycle, which you've probably heard of before.

And there's four parts to it.

First is stage one.

This is when you're barely asleep.

Your awareness goes down and muscle activity relaxes.

This is also the stage where this happens.

That was what the pros call a hypnic jerk.

So why does your own body give you a jump scare?

Well, researchers think that it could be your brain reacting to a sudden relaxation in the muscles and because it's stupid,

it interprets that as we're falling and jolts your muscles to double check.

But they aren't actually certain, so it could be something else.

Anyway, next is stage two, which is a light sleep.

This is where your heart rate slows, your body temperature decreases, and muscles relax even more.

But two other really interesting things happen here.

Sleep spindles, which are short bursts of brain activity, and K -complexes, which are big distinctive brainwaves.

Why?

Well, they seem to both have roles in protecting sleep and memory processing, but again, meh.

Then you get to stage three, deep sleep.

This is where activity is at its lowest, and your body takes advantage of that, increasing growth hormone secretion, tissue repair,

immune function support, and metabolic regulation.

It also takes that opportunity to use the glymphatic systems, which is a nerdy way of saying a waste clearing system for the brain as well.

And this is the stage where you're the most dead to the world.

You're just there, in your bed, catching your Z's, sleeping like a baby.

BOOM!

REM sleep.

All of a sudden your heart rate starts going up and down, brain activity jumps, and irregular breathing increases as well.

REM, or rapid eye movement, is where the most vivid of your dreams happen.

And yes, it's called rapid eye movement because your eyes are literally darting around while you sleep.

But, if you're having a dream that you're running away from the scariest thing you can imagine,

a job application, why don't you move in real life?

It's called REM -a -tonia.

Pretty much, your brainstem literally stops messages going from your brain to your skeletal muscles, while other messages for vital muscles such as your heart,

lungs and yes your eyes are allowed through.

But on the odd occasion it goes over time and is still stopping you from moving even when you wake up.

That's what causes sleep paralysis.

The thing where you're awake but you can't move.

And yes, because of this mix -up, dreamlike processes can still intrude your awakeness.

Hence why you sometimes can start hallucinating really scary things.

Like that job application.

Then you finish the cycle.

So, you do it again.

This whole cycle takes roughly 90 minutes.

But that can vary depending on the person.

And they're not even lengths either.

Usually, earlier in the night you actually get more deep sleep, whereas later in the night you get more REM sleep.

But then you wake up in the morning and think to yourself, why?

Think about it though, every night you're putting yourself in a state where you are extremely vulnerable to enemies, you can't eat, you can't drink,

you can't care for your children, you can't look for a girlfriend, you can't even fill out that job application.

And yet evolution has gone to extreme lengths in order to preserve this strange routine.

And when I say extreme, I mean extreme.

Think about dolphins for instance.

They need air to survive, but if they slept they would drown.

So they evolved to not need sleep right?

Nope.

They evolved so that to sleep they shut down half of their brain

and let that side sleep and just use the awake side and then just swap it over.

And not just dolphins, but many birds also do this too.

So why hasn't evolution just gotten rid of it altogether?

Why is it so persistent on keeping sleeping?

Well, we do know the important stuff that sleep does do.

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First, the brain needs maintenance, and it can't do it as effectively while it's awake.

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It's like trying to do maintenance in a warehouse.

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It's much easier to do it while it's empty rather than when it's full of customers.

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Second, the brain also needs to manage and sort what it learnt that day.

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Organise memories, new skills and get rid of old ones.

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Again, it seems that it can't do it as effectively while it's awake.

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And third is body repair.

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Yet again, it does it better when it's asleep.

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But I still have a problem with that.

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Why do we need to actually be asleep?

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As in unconscious?

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We could have just evolved to be able to repair, sort and maintain ourselves while awake.

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And yet evolution has been determined to keep it,

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and has clearly decided that it's worth the risk of not being conscious for 8 hours every day, than not to sleep at all.

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And that's the real mystery of sleep that no one has been able to really answer.

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Why do we really need sleep?

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And if you want to get a good night's sleep,

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a little birdie told me that hitting the subscribe button and show it two cold sides to your pillow for a week.

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이 레슨의 어휘와 말하기 포인트

이 말하기 레슨은 영상 “Why Do We Actually Need Sleep??”을(를) 바탕으로 합니다. 가장 자주 반복되는 단어는 다음과 같습니다: sleep, brain, awake, muscle, asleep. 이 영상에는 섀도잉할 문장 118개와 단어 1262개가 있습니다. 말하는 구간의 길이는 7:47입니다. 화자는 분당 약 162단어로, 일상 대화에 가까운 자연스러운 속도로 말합니다. 단어의 84%가 영어에서 가장 많이 쓰이는 3,000단어에 속합니다. 나머지는 연습 전에 미리 확인해 두세요. 전체 118문장 중 19문장이 질문이어서 의문문 억양과 짧은 대답을 연습하기에 좋습니다.

이 영상의 핵심 어휘

영상에 나오는 익혀 둘 만한 단어 15개를 발음, 뜻과 함께 정리했습니다.

단어	발음	뜻
awake 동사	/əˈweɪk/	일어나다
muscle 명사	/ˈmʌs.əl/	근육
asleep 형용사	/əˈsliːp/	잠들다
repair 동사	/ˈɹiːpɛɚ/	고치다, 수리하다
sudden 형용사	/ˈsʌd.ən/	급격한
rapid 형용사	/ˈɹæp.ɪd/	빠르다
scary 형용사	/ˈskɛə.ɹi/	공포의, 무섭다
relax 동사	/ɹɪˈlæks/	늦추다, 편안히 하다
sleepy 형용사	/ˈsliːpi/	졸리다
dolphin 명사	/ˈdɑlf.ɪn/	돌고래
cloud 명사	/ˈklaʊ̯d/	구름
mystery 명사	/ˈmɪs.t(ə.)ɹi/	신비, 미스터리
skill 명사	/skɪl/	기술, 스킬
occasion 명사	/əˈkeɪ̯ʒən/	기회, 경우
regulation 명사	/ˌɹɛɡjʊˈleɪʃən/	규칙

영상에 나오는 구동사

단어	발음	뜻
fill out 동사	/fɪl ˈaʊt/	기입하다
go down 동사		내려가다
go up 동사		올라가다
lie down 동사		눕다
wake up 동사	/ˌweɪk ˈʌp/	눈뜨다, 일어나다

따라 말해 볼 만한 문장

영상에 나오는 짧고 완결된 문장으로, 일상 대화에서 그대로 쓸 수 있습니다:

But first, what's happening while you're asleep?
This is when you're barely asleep.
The thing where you're awake but you can't move.
Why do we need to actually be asleep?
Why do we really need sleep?

이 영상의 문법

화자가 가장 많이 쓰는 문형을 영상 속 실제 표현과 함께 정리했습니다.

문형	영상 속 표현
현재완료 have/has + 과거분사 — 과거의 일이 지금도 관련이 있을 때	haven't we figured · have we even evolved · you've probably heard
관계절 who / which + 절 — 사람이나 사물에 대한 추가 정보	nucleus, which is · pressure, which makes · two, which is
수동태 be + 과거분사 — 누가 하는지보다 무슨 일이 일어나는지에 초점	could be spent · are allowed

주의할 발음

화자는 you're, can't, don't 같은 축약형과 약화된 형태를 28번 사용합니다. 들리는 대로 짧게 발음하세요.

“th” 소리: breathe /bɹiːð/, altogether /ɔl.tuˈɡɛð.ɚ/
“sh”와 “zh” 소리: evolution /ˌiːvəˈluːʃ(ə)n/, occasion /əˈkeɪ̯ʒən/, regulation /ˌɹɛɡjʊˈleɪʃən/, tissue /ˈtɪʃ.(j)u/, conscious /ˈkɑn.ʃəs/
긴 단어 — 강세 위치에 주의: evolution /ˌiːvəˈluːʃ(ə)n/, regulation /ˌɹɛɡjʊˈleɪʃən/, accidentally /ˌæk.sɪˈdɛnt(ə)li/, altogether /ɔl.tuˈɡɛð.ɚ/, irregular /ɪˈɹɛɡ.jə.lɚ/

한국어 화자가 어려워하는 소리:

/f/ — ㅍ(/p/)으로 바꾸지 말고 윗니를 아랫입술에 대기: dolphin /ˈdɑlf.ɪn/, roughly /ˈɹʌf.li/, glymphatic /ɡlɪmˈfæ.tɪk/
/v/ — ㅂ(/b/)과 구별하기: evolve /ɪˈvɑlv/, evolution /ˌiːvəˈluːʃ(ə)n/, vital /ˈvaɪtəl/, vary /ˈvɛəɹi/, vulnerable /ˈvʌln(ə)ɹəbl̩/
/z/ — ㅈ이 아니라 성대를 울리는 /s/: whereas /(h)wɛɹˈæz/, preserve /pɹəˈzɝv/, suprachiasmatic /ˌsuːpɹəkʌɪəzˈmatɪk/

이 영상으로 연습하는 방법

먼저 말하지 않고 영상을 끝까지 듣고 모르는 단어를 적어 둡니다.
0.75배속으로 한 문장씩 섀도잉을 시작하고, 익숙해지면 보통 속도로 돌아갑니다.
자신의 목소리를 녹음해 원본과 비교하고, awake, muscle, asleep 같은 단어에 특히 주의합니다.

쉐도잉이란? 영어 실력을 빠르게 키우는 과학적 방법

쉐도잉(Shadowing)은 원래 전문 통역사 훈련을 위해 개발된 언어 학습 기법으로, 다언어 학자인 Dr. Alexander Arguelles에 의해 대중화된 방법입니다. 핵심 원리는 간단하지만 매우 강력합니다: 원어민의 영어를 들으면서 1~2초의 짧은 지연으로 즉시 소리 내어 따라 말하는 것——마치 '그림자(shadow)'처럼 화자를 따라가는 것입니다. 문법 공부나 수동적인 청취와 달리, 쉐도잉은 뇌와 입 근육이 동시에 실시간으로 영어를 처리하고 재현하도록 훈련합니다. 연구에 따르면 이 방법은 발음 정확도, 억양, 리듬, 연음, 청취력, 말하기 유창성을 크게 향상시킵니다. IELTS 스피킹 준비와 자연스러운 영어 소통을 원하는 분들에게 특히 효과적입니다.

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쉐도잉 연습: Why Do We Actually Need Sleep?? - 영상으로 영어 말하기 배우기

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