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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.
Merely thinking about or seeing someone yawning can make you yawn. But why?
But there's a window: People yawn most when it's around 68 degrees. When it's really hot outside, people are less likely to yawn because it would have very little impact on the brain's temperature.
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A higher occurrence is reported in people with irregular sleep schedules. [4] When they are particularly frequent and severe, hypnic jerks have been reported as a cause of sleep-onset insomnia. [3] Hypnic jerks are common physiological phenomena. [5] Around 70% of people experience them at least once in their lives with 10% experiencing them daily.
Hypnagogia is the transitional state from wakefulness to sleep, also defined as the waning state of consciousness during the onset of sleep. (Its corresponding state is hypnopompia –sleep to wakefulness.)
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 ...
This system enables people to keep their balance by signalling when a physical correction is necessary. Some medical conditions, known as balance disorders , also induce the sensation of falling. In the early stages of sleep , a falling sensation may be perceived in connection with a hypnic jerk , sometimes awaking the sleeper abruptly.
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