Shadowing Practice: What If You Never Slept? - Learn English Speaking with Video

Can we evolve so that we never have to sleep?

First, we need to upgrade your body's reset system.

When you sleep, your neurons pulse in a slow rhythm, reducing the noise in your brain and preserving what you learnt.

We need to fix that reset program so it runs

while you're still awake by implanting electrodes across the entire brain cortex to reset one region at a time.

Next, we need to get rid of your brain's toxic waste.

Protein byproducts that build up through the day are flushed out when you sleep.

The spaces between brain cells open up and fluid carries the toxins away.

Without this, the proteins accumulate and you may get Alzheimer's.

So each half of your brain will need to take it in turns to be cleaned while the other stays awake.

But all this comes at a cost.

Your brain already burns around 20% of your body's energy.

Keeping your brain running 24-7 would require around 3 times as much.

And biologically, you are not human anymore.

You are closer to a bottlenose dolphin that can put half of its brain to sleep while the other half stays conscious.

Nature hasn't found the perfect hack for zero sleep, but if we cram these fixes into a wearable sleep suit, you might be very hungry, but otherwise truly unstoppable.

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Vocabulary and speaking notes for this lesson

This video has 16 sentences and 222 words to shadow. The speech runs for 1:09. The speaker talks fast, about 192 words per minute, so expect linked and reduced sounds. Only 79% of the words are among the 3,000 most common in English, so the vocabulary is demanding.

Key vocabulary in this video

15 words from the video worth learning, with pronunciation and meaning:

Word	Pronunciation	Meaning
reset verb	/ɹiːˈsɛt/	To set back to the initial state.
awake verb	/əˈweɪk/	To become conscious after having slept.
hungry adjective	/ˈhʌŋ.ɡɹi/	Affected by hunger; having the physical need for food.
toxic adjective	/ˈtɒk.sɪk/	Having a chemical nature that is harmful to health or lethal if consumed or otherwise entering into the body in sufficient quantities.
upgrade verb	/əpˈɡɹeɪd/	To improve, usually applied to technology, generally by complete replacement of one or more components.
fluid noun	/ˈflu.ɪd/	Any substance which can flow with relative ease, tends to assume the shape of its container, and obeys Bernoulli's principle; a liquid, gas or plasma.
preserve verb	/pɹəˈzɝv/	To protect; to keep from harm or injury.
conscious adjective	/ˈkɑn.ʃəs/	Alert, awake; with one's mental faculties active.
pulse noun	/pʌls/	A normally regular beat felt when arteries near the skin (for example, at the neck or wrist) are depressed, caused by the heart pumping blood through them; the…
rhythm noun	/ˈɹɪð.əm/	The variation of strong and weak elements (such as duration, accent) of sounds, notably in speech or music, over time; a beat or meter.
evolve verb	/ɪˈvɑlv/	To move (something) in regular procession through a system.
flush verb	/ˈflʌʃ/	To cleanse by flooding with generous quantities of a fluid.
dolphin noun	/ˈdɑlf.ɪn/	A carnivorous cetacean, typically with a beak-like snout, famed for their intelligence and occasional willingness to approach humans.
cortex noun	/ˈkɔɹtɛks/	The outer layer of an internal organ or body structure, such as the kidney or the brain.
accumulate verb	/əˈkjuːmjʊˌleɪt/	To heap up in a mass; to pile up; to collect or bring together (either literally or figuratively), often gradually and without active intent.

Phrasal verbs you will hear

Word	Meaning
build up verb	To erect; to construct.
open up verb	To open.

Pronunciation to watch

The “sh” and “zh” sounds: conscious /ˈkɑn.ʃəs/, flush /ˈflʌʃ/
Long words — get the stress right: accumulate /əˈkjuːmjʊˌleɪt/, unstoppable /ʌnˈstɔ.pə.bəl/

How to practise with this video

Listen to the whole video once without speaking and note the words you do not know.
Start at 0.75× speed, shadow it sentence by sentence, then go back to normal speed once it feels easy.
Record yourself and compare with the original, paying attention to words like reset, awake, hungry.

Grammar in this video

The structures the speaker uses most, with the exact words from the video:

Structure	In the video
Passive voice be + past participle — the focus is on what happens, not who does it	are flushed · be cleaned
Present perfect have/has + past participle — a past action that still matters now	hasn't found

What is the Shadowing Technique?

Shadowing is a science-backed language learning technique originally developed for professional interpreter training and popularized by polyglot Dr. Alexander Arguelles. The method is simple but powerful: you listen to native English audio and immediately repeat it out loud — like a shadow following the speaker with just a 1–2 second delay. Unlike passive listening or grammar drills, shadowing forces your brain and mouth muscles to simultaneously process and reproduce real speech patterns. Research shows it significantly improves pronunciation accuracy, intonation, rhythm, connected speech, listening comprehension, and speaking fluency — making it one of the most effective methods for IELTS Speaking preparation and real-world English communication.

Shadowing technique: read the full step-by-step guide →

Shadowing Practice: What If You Never Slept? - Learn English Speaking with Video

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Vocabulary and speaking notes for this lesson

Key vocabulary in this video

Phrasal verbs you will hear

Pronunciation to watch

How to practise with this video

Grammar in this video

What is the Shadowing Technique?