Yawning Cools Your Brain

Research conducted at the University of Vienna suggests that yawning may play an essential role in cooling our brains. But yawning to cool the brain is “not functional” when the outside temperature is as hot as the body, explained the study’s lead author Jorg Massen. And if you’re wondering: Yes, sleep deprivation does increase brain temperature, which could be a factor in why we yawn more when we’re tired.