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  2. 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.

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

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

    This explains why people with medical conditions that cause an increased core body temperature like multiple sclerosis (MS), epilepsy, anxiety, and head trauma experience excessive yawning ...

  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. 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.

  6. Sleep and metabolism - Wikipedia

    en.wikipedia.org/wiki/Sleep_and_Metabolism

    As sleep time decreased over time from the 1950s to 2000s from about 8.5 hours to 6.5 hours, there has been an increase in the prevalence of obesity from about 10% to about 23%. [2] Weight gain itself may also lead to a lack of sleep as obesity can negatively affect quality of sleep, as well as increase risk of sleeping disorders such as sleep ...

  7. Dr. Seuss's Sleep Book - Wikipedia

    en.wikipedia.org/wiki/Dr._Seuss's_Sleep_Book

    Children's literature portal; Dr. Seuss's Sleep Book, also known as The Sleep Book, [1] is an American children's book written by Dr. Seuss in 1962. The story centers on the activity of sleep as readers follow the journey of many different characters preparing to slip into a deep slumber. [2]

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

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

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  9. Neuroscience of sleep - Wikipedia

    en.wikipedia.org/wiki/Neuroscience_of_sleep

    One of the important questions in sleep research is clearly defining the sleep state. This problem arises because sleep was traditionally defined as a state of consciousness and not as a physiological state, [14] [15] thus there was no clear definition of what minimum set of events constitute sleep and distinguish it from other states of partial or no consciousness.