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  2. The science behind why yawning is contagious - AOL

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

    In order to take a closer look, researchers monitored 36 participants as they watched other people yawn. Turns out it comes down to each person’s excitability.

  3. Body Works and Quirks: Yawning [Video] - AOL

    www.aol.com/news/body-works-quirks-yawning...

    Watch the video above — and read more here — to find out. Merely thinking about or seeing someone yawn can make you yawn (you’re probably yawning right now). ... Most people yawn because ...

  4. 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?

  5. Yawn - Wikipedia

    en.wikipedia.org/wiki/Yawn

    Snakes yawn, both to realign their jaws after a meal and for respiratory reasons, as their trachea can be seen to expand when they do this. Dogs, and occasionally cats, often yawn after seeing people yawn [11] [65] and when they feel uncertain. [66] Dogs demonstrate contagious yawning when exposed to human yawning.

  6. Catathrenia - Wikipedia

    en.wikipedia.org/wiki/Catathrenia

    Catathrenia or nocturnal groaning is a sleep-related breathing disorder, consisting of end-inspiratory apnea (breath holding) and expiratory groaning during sleep.It describes a rare condition characterized by monotonous, irregular groans while sleeping. [1]

  7. Sleep and metabolism - Wikipedia

    en.wikipedia.org/wiki/Sleep_and_Metabolism

    In a study where subjects were restricted to 4 hours of sleep per night for 2 nights, leptin levels decreased by 18% and ghrelin levels increased by 28%. In addition, there was an increase in hunger rating by 23%, with leptin levels being a significant predictor of hunger levels.

  8. Why is yawning contagious? Here are all the facts about your ...

    www.aol.com/news/why-yawning-contagious-yawning...

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  9. Why We Sleep - Wikipedia

    en.wikipedia.org/wiki/Why_We_Sleep

    Why We Sleep: The New Science of Sleep and Dreams (or simply known as Why We Sleep) is a 2017 popular science book about sleep written by Matthew Walker, an English scientist and the director of the Center for Human Sleep Science at the University of California, Berkeley, who specializes in neuroscience and psychology.