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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.
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?
Image credits: LittlleMommys #6. I was a summer camp director for a few years before Covid made the camp go out of business. I ran the programming for the older kids & teens, my peer ran the ...
Many cultural stories have been told about people falling asleep for extended periods of time. [ 158 ] [ 159 ] The earliest of these stories is the ancient Greek legend of Epimenides of Knossos . [ 158 ] [ 160 ] [ 161 ] [ 162 ] According to the biographer Diogenes Laërtius , Epimenides was a shepherd on the Greek island of Crete .
Narcolepsy is a chronic neurological disorder that impairs the ability to regulate sleep–wake cycles, and specifically impacts REM (rapid eye movement) sleep. [1] The pentad symptoms of narcolepsy include excessive daytime sleepiness (EDS), sleep-related hallucinations, sleep paralysis, disturbed nocturnal sleep (DNS), and cataplexy. [1]
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 ...
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.