Another theory of yawning proposes that yawning cools down our brains. Yawning is responsible for us inhaling a larger amount of cool air, which cools the blood that's going to the brain. According to those with this hypothesis, before we yawn, the body experiences a rise in temperature. It is, however, a theory that doesn't have a lot of evidence. While that's the case, medically induced fevers have been known to spur on increased yawning rates. So, a temperature change may have something to do with it.
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