Napping and Alertness: B2 English Reading, Vocabulary

Level: B2

Printable: Student handout (PDF) | Teacher’s key (PDF)

Reading

Around two or three o’clock in the afternoon, many people hit a slump. Your eyes feel heavy, your concentration fades, and a second coffee does not seem to help. In busy, achievement-focused cultures, people are often told to push through with caffeine and willpower. Sleep research suggests that a short nap may work better, but the details matter, and not every popular claim about napping holds up.

How long you sleep makes a big difference. In a 2006 experiment at Flinders University in Australia, 24 healthy young adults, sleep-deprived after sleeping only five hours the night before, took naps of different lengths. A 10-minute nap improved alertness, the state of being awake and ready to react, almost immediately, and some benefits lasted about two and a half hours. A 20-minute nap also helped, but the improvement took about 35 minutes to appear. After a 30-minute nap, people first showed impaired performance and only improved later. The explanation is sleep inertia: waking up from deeper sleep can leave you groggy and confused. A short nap of 20 minutes or less is often called a power nap. Researchers still debate the ideal length.

Some of the best-known evidence comes from aviation. In a NASA study of long-haul flights, 12 crew members took a planned 40-minute rest during the quiet cruise phase, while nine others kept working as a control group. The crew who rested fell asleep in about six minutes and slept for about 26 minutes on average. They showed better alertness and performance than the control group, including during descent and landing. The lead author, Mark Rosekind, has reported gains of 34 percent in performance and 54 percent in alertness, though some accounts give a higher figure for alertness. The groups were small and the setting was unusual, so the results are no promise for a student or an office worker.

Napping may also help learning. In a much-cited experiment led by Sara Mednick at Harvard, volunteers practiced a visual task and were tested again later. Those who took a nap of 60 to 90 minutes improved by about as much as people normally do after a full night of sleep. Researchers think sleep helps the brain consolidate new learning, which means turning fragile new memories into stronger, longer-lasting ones. Some studies report similar benefits for memorizing facts, so a nap after studying may help you recall the material later. But this result comes from one specific visual task, and the naps that worked included both deep sleep and dreaming sleep, so it does not show that a nap can replace a night of sleep.

Napping is also a cultural question. A midday rest, the siesta, has long been part of daily life in parts of the Mediterranean and Latin America. In Greece, researchers followed nearly 24,000 adults with no history of heart disease, stroke, or cancer. Over about six years, those who napped for at least 30 minutes three or more times a week had a 37 percent lower risk of dying from heart disease. That is an association, not proof: the study only observed people’s habits, and its authors said more studies were needed. In Japan, sleeping in meetings or on trains, called inemuri, or “sleeping while present,” is often tolerated, and it can even suggest dedication, because it implies you worked yourself to exhaustion. The scholar Brigitte Steger says unwritten rules apply: senior workers have more freedom, and you must still look present.

Guidance also changes. The Mayo Clinic’s current advice calls a 20- to 30-minute nap ideal for healthy adults, but an earlier version said 10 to 20 minutes. It lists drawbacks, including grogginess and, for people who already have insomnia, possible trouble sleeping at night. It suggests napping in the early afternoon, because a nap after about three o’clock can make it harder to sleep soundly. It also notes that some research links naps longer than an hour a day with higher risks of high blood pressure, diabetes, and heart disease. The Greek study, the NASA trial, and the Flinders experiment involved different people in different situations, so none of them shows what a 20-minute nap at two o’clock would do for you.

Vocabulary

Each word has a frequency score, a rank, and a tag. The score shows how common the word is in modern English: higher means more common, and each full point means roughly ten times more common. The rank is the word’s position on a list of about 321,000 English word forms, from most to least common. The tag shows where you are most likely to meet the word: Current, Formal, Literary, or Dated. The paragraph number shows where the word first appears in the reading. The labels are information, not instructions. Deciding which words are worth your time is up to you. How to read the scores, ranks, and tags.

Many people hit an afternoon slump around three o’clock.
The team went into a slump after losing four games in a row.

Caffeine and willpower are the usual ways people push through tiredness.
It takes willpower to save money when everything around you is on sale.

The volunteers were sleep-deprived after sleeping only five hours.
Sleep-deprived drivers react more slowly and make more mistakes.

A 10-minute nap improved alertness almost immediately.
Strong coffee helped her keep her alertness during the night shift.

After a 30-minute nap, people first showed impaired performance.
Heavy rain left the driver’s vision impaired.

Sleep inertia is the reason a long nap can leave you feeling worse.
He felt sleep inertia for almost half an hour after waking from a deep sleep.

A long nap can leave you groggy and confused.
I felt groggy all morning after only four hours of sleep.

A short nap of 20 minutes or less is often called a power nap.
She took a power nap in her car before the evening class.

The crew who kept working as usual formed the control group.
The researchers compared the new medicine with a control group that received no treatment.

Sleep may help the brain consolidate new learning.
The company plans to consolidate its three small offices into one.

A nap after studying may help you recall the material later.
I can recall the plot of the film, but not the names of the actors.

The Greek study found an association between napping and a lower risk of heart disease.
Researchers found an association between late bedtimes and lower grades, but not proof of cause.

In Japan, sleeping in meetings is often tolerated.
The school tolerates small mistakes but not dishonesty.

People with insomnia may find that napping makes night sleep worse.
Her insomnia got worse during exam week, and she slept only four hours a night.

The Mayo Clinic lists grogginess as one of the drawbacks of napping.
The apartment is cheap, but it has some drawbacks, such as a long commute.

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Speed Challenge

Answer 12 questions against the clock. Every wrong answer adds 5 seconds, and the lowest score wins. Open the speed challenge in a new tab.

Comprehension Questions

According to the reading, what often happens to people around two or three o’clock in the afternoon?
In the Flinders University experiment, what happened after the 30-minute nap?
What is sleep inertia, and why does it matter when people think about how long to nap?
How did the NASA researchers test the effect of napping? Explain what the crew and the control group did.
Why does the writer say the NASA results should be treated with care?
What did Sara Mednick’s experiment find, and what are two limits of that result?
What does the writer mean by saying the Greek study shows “an association, not proof”?
How is inemuri seen in Japan, and what unwritten rules does the reading mention?
The writer says that guidance also changes. What evidence does the reading give, and why does it matter for readers?

IELTS-Style Questions

True, False, or Not Given: “In the Flinders experiment, a 30-minute nap gave an immediate improvement.” Explain your answer using evidence from the reading.
Yes, No, or Not Given: “The writer believes that napping is harmful for most people.” Explain your answer using evidence from the reading.
Author’s purpose: Why does the writer end by listing the Greek study, the NASA trial, and the Flinders experiment together? Is the aim to prove that naps work, to show the limits of each study, or something else?

AI Discussion Prompt

I just read an article about the science and culture of napping. It covered an experiment on nap length and sleep inertia, a NASA study of flight crews, a Harvard experiment on naps and learning, a Greek study linking siestas to a lower risk of heart disease, the Japanese custom of inemuri, and the Mayo Clinic’s advice, including its drawbacks. I am an English learner at about B2 level. Please ask me one question at a time, starting with how I feel about taking naps. Respond to my ideas first, then briefly correct any language errors, and ask follow-up questions that make me explain my reasons.

AI Vocabulary Prompt

I want to practice vocabulary from an article about napping. Please quiz me on the following words one at a time, using a mix of question types: multiple choice, true/false, and sentence completion. Give me feedback after each answer before moving on, and bring back the words I miss later. Here are the words: slump, willpower, sleep-deprived, alertness, impaired, sleep inertia, groggy, power nap, control group, consolidate, recall, association, tolerated, insomnia, drawbacks.

Discussion Questions

Do you ever take naps? If yes, how do you usually feel afterward? If not, why not?
Do you get an afternoon slump? What do you usually do about it?
What is the strangest or most uncomfortable place where you have ever fallen asleep?
In your country, is it normal to nap at school, at work, or on public transport? How do other people react?
Imagine your school or workplace had a quiet room for naps. Would you use it? What might the benefits and drawbacks be?
In Japan, looking tired can suggest that someone has worked hard. Do you think that is fair? Does it happen where you live?
Have you ever made a mistake because you were tired? What happened, and what would you do differently?
Do you think resting and sleeping are the same thing? Can you rest without sleeping, and is that enough?
The reading says the ideal nap length is still debated. When you get conflicting health advice, how do you decide what to believe?
The Greek study shows an association, not proof. Can you think of another everyday habit that is linked to good health but might not cause it?
Many students stay up late to study or to socialize. Do you think this is healthy, and what could change it?
In some places, shops and offices close for a long midday break. Would that be realistic where you live? Who might gain, and who might lose?
Should sleep be taught as a health skill in schools, like nutrition or exercise? Why or why not?
If you could design your ideal daily schedule with time for rest built in, what would it look like, and what would stop you from following it?

Language Focus: Reporting Verbs

What it is: Reporting verbs introduce what a study, an expert, or an organization found or said. The verb you choose also shows how certain the writer is.

Why writers use it: Naming the source and choosing the verb carefully makes clear whose claim it is. Found and showed suggest results, suggests and notes are more cautious, and warns points to a risk. This matters in academic writing and in summaries.

Examples from the reading:

“Sleep research suggests that a short nap may work better…”
“The lead author, Mark Rosekind, has reported gains of 34 percent in performance…”
“It also notes that some research links naps longer than an hour a day with higher risks…”
“…its authors said more studies were needed.”

Practice task: Rewrite this sentence so that it names a source and uses a reporting verb: “Naps improve learning.”

(Example answer: “A Harvard experiment found that naps of 60 to 90 minutes improved performance on a visual task.”)

Recommended Resources

Are naps actually good for us? (TED, Matt Walker). A short video by a sleep scientist on the advantages and drawbacks of napping.
Napping: Do’s and don’ts for healthy adults (Mayo Clinic). The guidance discussed in paragraph 6, including timing, length, and drawbacks.
Sleeping your way to heart health (Harvard Gazette). A report on the Greek study of siestas and heart disease, with the researchers’ own cautions.
Napping in public in Japan? That’s a sign of diligence (Malay Mail, from a newspaper report). An article on inemuri, including Brigitte Steger’s explanation of its unwritten rules.
Effects of planned cockpit rest on crew performance and alertness in long-haul operations (NASA Technical Reports Server). The abstract of the original NASA report. It is technical, but it shows the study’s design and group sizes.