Why Do We Yawn?
Reviewed: Dr. Gromatzky
5. Cooling the Brain
Our brain is a powerful organ the most powerful that we know of. It uses a lot of energy to operate at full effectiveness and it also generates a great deal of heat. Indeed, a large percentage of our body heat is lost through our heads, which is why it is often so important to wear a hat in cold weather.
Our brain can get too hot, though, and it is important to help cool it down when it does. Yawning is a mechanism that can help to keep the temperature down. Studies have shown that people will yawn more often in cooler weather, perhaps because the cooler air will be more effective at cooling our brains.
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