Yawning is usually associated with boredom or being tired but a new study has revealed that yawning actually is a way to ventilate our brain i.e a way of regulating brain temperature and thus keeping it cool.
Yawning may help cool the brain through the deep inhalation of cool air and by enhanced blood flow to the brain caused by the stretching of the jaw.
Yawning causes the walls of the maxillary sinus to expand and contract like a bellows, pumping air into the brain, which lowers its temperature.
New research, also showed that more people yawned when it was winter compared to when it was summer, which supports Gallup’s theory that people should yawn more in cold weather because the cool air you inhale helps regulate your brain temperature.
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