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2. Why you yawn when you’re bored, according to experts - AOL

   www.aol.com/lifestyle/why-yawn-bored-according...

   It was once believed that the main function of yawning was to increase otherwise low oxygen levels, but a 1987 study disproved that theory. And despite extensive additional research on yawning ...

3. Why do we yawn — and why is it so contagious? Experts explain.

   www.aol.com/lifestyle/why-yawn-why-contagious...

   Merely thinking about or seeing someone yawning can make you yawn. But why?

4. The science behind why yawning is contagious - AOL

   www.aol.com/news/2017-09-01-the-science-behind...

   When scientists increased the excitability by using external transcranial magnetic stimulation, the contagious yawning also increased. So why is this important? After all it’s just a yawn right.

5. Yawn - Wikipedia

   en.wikipedia.org/wiki/Yawn

   Dogs demonstrate contagious yawning when exposed to human yawning. Dogs are very adept at reading human communication actions, so it is unclear if this phenomenon is rooted in evolutionary history or a result of domestication. [67] Fish can also yawn, and they will increase this behavior when experiencing a lack of oxygen. [68]

6. Exhalation - Wikipedia

   en.wikipedia.org/wiki/Exhalation

   Yawning is a reflex that tends to disrupt the normal breathing rhythm and is believed to be contagious as well. [14] The reason why we yawn is unknown. A common belief is that yawns are a way to regulate the body's levels of O 2 and CO 2, but studies done in a controlled environment with different levels of O 2 and CO 2 have disproved that ...

7. Hypoxia (medicine) - Wikipedia

   en.wikipedia.org/wiki/Hypoxia_(medicine)

   Hypoxia can be due to external causes, when the breathing gas is hypoxic, or internal causes, such as reduced effectiveness of gas transfer in the lungs, reduced capacity of the blood to carry oxygen, compromised general or local perfusion, or inability of the affected tissues to extract oxygen from, or metabolically process, an adequate supply ...

8. Why do we yawn — and why is it so contagious? Experts explain.

   www.aol.com/news/why-do-we-yawn-and-why-is-it-so...

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9. Intermittent hypoxia - Wikipedia

   en.wikipedia.org/wiki/Intermittent_hypoxia

   Intermittent hypoxia (also known as episodic hypoxia) is an intervention in which a person or animal undergoes alternating periods of normoxia and hypoxia.Normoxia is defined as exposure to oxygen levels normally found in Earth's atmosphere (~21% O 2) and hypoxia as any oxygen levels lower than those of normoxia.