Why Do I Yawn?

Adam and Tess, via Fllickr

Liz Waid and Nick Page look at a simple physical behavior - yawning. Everyone in the world yawns every day, but scientists do not know why!

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Voice 1 

Welcome to Spotlight. I’m Nick Page.

Voice 2 

And I’m Liz Waid. Spotlight uses a special English method of broadcasting. It is easier for people to understand no matter where in the world they live.

Voice 1 

Yawning. It is something that people everywhere do. It is a simple motion. Open your mouth extremely wide. Pull air into your mouth. Your lungs expand to fill with fresh air. The muscles near your stomach pull in. Your whole body feels a good stretch. Then you blow the rest of the air out.

Voice 2 

As you were listening, did you just yawn? That is another interesting thing about yawning. It is contagious. That is, when a person sees another person yawning, she may yawn too. Yawns seem to move from person to person. In fact, we may only need to hear or see the word yawn to begin yawning.

Voice 1 

But why do we yawn? Is there a reason? Why is yawning contagious? These are some of the questions we aim to answer in today’s program. Today’s Spotlight is on yawning.

Voice 2 

Scientists all over the world have tried to understand why people yawn. Andrew Gallup is a behavioral biologist at Princeton University. He studies how a person’s behavior and body are linked. He told Sciencenews.org:

Voice 3 

“Every single day, every person on the planet yawns. But we have no idea why we do it.”

Voice 1 

A yawn seems like a simple thing. We do not even think about yawning when we do it. It is an involuntary action. People do not choose to yawn. It is a natural reaction of the body. But yawning is really very complex. It involves many parts of a person’s body. Yawning has a physical effect on our bodies. Studies have shown that yawning increases a person’s heart rate. His heart beats faster. Yawning increases the flow of blood in a person’s body.

Voice 2 

Scientists do have some theories about why people yawn. Some of the theories are social theories. One social theory about yawning is a very simple one. People yawn when they are tired or bored - that is, when they are not interested in what is going on around them. But many people yawn even if they are not tired. For example, even Olympic athletes may yawn when they are getting ready to compete. People do yawn when they are tired. But this cannot be the only reason why people yawn.

Voice 1 

Some scientists believe people yawn because our bodies have changed to do that through history. They say ancient people learned to yawn over many years. People may have begun yawning as a way to quickly communicate with other people around them. For example, imagine you are a person living many thousands of years ago. Imagine you saw a dangerous animal, like a lion or tiger. If you made a sound, the animal might hear you. But, if you open your mouth wide into a yawn, you can communicate your message quietly. However, this theory does not really explain why people yawn. If yawns communicate danger, why do we yawn when we are tired?

Voice 2 

Other theories say people yawn for a particular physical purpose. For example, maybe yawning helps a person’s body to get more oxygen. Oxygen is one important gas in air. When we breathe, we pull oxygen into our lungs. It is necessary to make our bodies work. Could yawning mean a person is trying to get more oxygen?

Voice 1 

Robert Provine is also an expert on yawning. He led an experiment in 1987 to test this theory. He tested the theory on a group of college students. He wanted to discover if students yawned more when there was less oxygen.

Voice 2 

Provine observed the students while they breathed different kinds of air. But it did not matter how much oxygen was in the air. Students all yawned at the same rate. He believes that yawning does not have anything to do with breathing. People do not yawn to get more oxygen.

Voice 1 

A more recent theory about yawning suggests people yawn to keep their brains cool. Andrew Gallup led a study to test this theory. Gallup studied 80 people in the winter, and 80 in the summer. He found that people were more likely to yawn in the summer than in the winter. He believes this is because it is more difficult for a person’s brain to stay cool in the summer. A cooler brain can work better. So, when it is hot, a person’s body begins a yawn. The yawn pulls in air to cool the brain.

Voice 2 

Is this the real reason people yawn? No one really knows for sure. People have been asking this question for thousands of years!

Voice 1 

But there is another mystery about yawning. Why is yawning so contagious? Doctor Catriona Morrison is a psychologist. She studies human behaviour. And she teaches at the University of Leeds. She told the BBC:

Voice 4 

“Contagious yawning is a very interesting behaviour. You do not need to see the yawn. You do not even need to hear the yawn. You can just read about it or think about it and it gets you going.”

Voice 2 

Doctor Morrison led a team of researchers to investigate contagious yawning. Researchers used students for their experiment. Each student sat in a room with a secret researcher. The secret researcher yawned often. Researchers observed if the students yawned too - and how many times. After ten minutes, each student took a short test. In the test, the student tried to identify the feelings of another person. Doctor Morrison’s team discovered that the students who yawned were more likely to also understand another person’s feelings. This is the idea of empathy - being able to understand the way another person feels. Doctor Morrison told the BBC:

Voice 4 

“We believe that contagious yawning shows empathy. It shows that a person can understand another person’s body and mind.”

Voice 2 

Yawning is not very contagious for every person. People who have trouble feeling empathy will not yawn contagiously. And children do not experience contagious yawning until about age four. This is about the age when children develop the ability to feel empathy.

Voice 1 

The link between yawning and empathy is solid. Scientists have also taken pictures of people’s brains. These pictures show areas that are active when a person is reacting to yawning. The same areas are active when a person is thinking about another person’s feelings.

Voice 2 

Yawning is just one of the amazing and strange things our bodies do. We may never know why people yawn, or why yawning is contagious. But one thing is sure. Many people think of a yawn as something rude. So if you must yawn, make sure you cover your mouth while you do it!

Voice 1

The writer and producer of this program was Liz Waid. The voices you heard were from the United Kingdom and the United States. All quotes were adapted for this program and voiced by Spotlight. You can listen to this program again, and read it, on the internet at www.radioenglish.net. This program is called, ‘Why Do I Yawn?’

Voice 2 

You can also leave your comments on our website. And find us on Facebook - just search for Spotlight Radio. We hope you can join us again for the next Spotlight program. Goodbye.

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*Some of the music in this program came from Podington Bear*


When do you yawn? Did you yawn during this program?


Luis Piedra's avatar
Luis Piedra
said on January 14, 2013

Good program
Thamks Spotlight

Avatar Spotlight
said on January 14, 2013

very interesting I liked thank you

humble71's avatar
said on January 14, 2013

Thanks Liz for this research about yawning. Sincerely when I yawn is when something is not very deep of interesting for me or when I’m receiving a class of anything and the instructor is bored or brave and I don’t pay attention to the class. How can I eliminate yawning attack? Well I open my arms , stand up and go to the coffe shop and drink a cup of american coffee.  Thanks so much for producing this topic.
Good bye my friends..

Hen Xui's avatar
Hen Xui
said on November 21, 2016

i yawn while i read it :) i think this topic cause an yawn for me, haha

Avatar Spotlight
Ken nguyen PH
said on November 23, 2016

we always yawn when feeling sleepy. Why this story did not tell about sleepy ?

Avatar Spotlight
said on November 24, 2016

I’m Italian and I like studying English. I desire to thank Spotlight for their daily programs.

Avatar Spotlight
said on November 27, 2016

Every day, i often yawn very a lot of times and after yawn each time i felt very interesting and calmer. I often yawn while i feel tried or bored, it like SPOTLIGHT said in this program .With me , Yawn is a simple motion and it is a help for our body. thanks !

Severino Ramos da Silva's avatar
Severino Ramos da Silva
said on December 31, 2016

From: .(JavaScript must be enabled to view this email address)
To: spotlight programme
Subject: answer to the questions above
Date: Saturday 31, December 2016
São Paulo SP Brazil

Dear Liz Waid and Nick Page:

At first, I want to thank you for bringing us readers and learners of English more one great article, thanks!
I think that I yawn because my brain has told me that I need to have a rest. My body is very tired and my brain recognizes that.
No, I did not. Read and listen to the spotlight programme carefully to learn everything.
I yawn so much when I return home from work.

Your regards,
Severino Ramos
Happy New Year!

Avatar Spotlight
said on June 19, 2019

I yawned many times while I read.

Avatar Spotlight
said on June 20, 2019

Like everyone, I yawn constantly. I have observed yet the aspect contagious of yawning and I think some teenagers show their boring feel with a large yawn.
I think Liz Waid was very happy when she developed and produced this program. Thank you.