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If your head is overheated, there's a good chance you'll yawn soon, according to a new study that found the primary purpose of yawning is to control brain temperature.
The finding solves several mysteries about yawning, such as why it's most commonly done just before and after sleeping, why certain diseases lead to excessive yawning, and why breathing through the nose and cooling off the forehead often stop yawning.
It may not be one of life’s deepest mysteries, but as scientific conundrums go, it has a peculiar staying power. Why is yawning contagious?
Researchers recently found that yawning isn’t only catching among people; it is also among chimpanzees.
Originally posted by plutoxgirl
Once someone told me, it's because I'm releasing "negative energy" absorbed from that specific place.