Scientists: Your brain is overheated when you yawn
May 8 , 2014
Researchers claim that we yawn when our brains are cool due to being warm outside. A recent study showed photographs of yawns to people in Arizona and Austria and experts noted that such yawns occurred more when temperatures are about 68 degrees Fahrenheit.
Scientists said people yawn when they have cool air to lower their temperatures. Previous studies have also shown that yawning occurs when the body temperature is higher.
These reports agree with the idea that we yawn when we're tired since stress and tiredness are known to affect our brain temperatures.