Yawning Cools Overheated Brain
2013-07-01
By:James Fraser
Yawning is a sign of sleepiness, tiredness or boredom. Do you know yawning is a brain's function to cool itself when it's overheated or over worked? When you yawn, your brain relaxes instantly. The process also increases blood flow (oxygen) to the brain.
This Post Belongs To 15 WTFacts About Brain You May Not Know 
