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In a new study, researchers from the University of Nottingham looked at the brain to determine what makes yawning contagious.
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 ...
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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.
In one study, about 30% of people who had PTSD (post-traumatic stress disorder) talk in their sleep. [4] A 1990 study showed that Vietnam War veterans having PTSD report talking more in their sleep than do people without PTSD. [5] Sleep-talking can also be caused by depression, sleep deprivation, day-time drowsiness, alcohol, and fever.
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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 ...