Just chill your brain by yawning Most recent study proves that yawning help out in keep the brain chill disagree with the admired faith that yawning endorses sleep and is a symbol of fatigue. Mouth is open Unwillingly and taking mouthful of air. Whenever man open there mouth for taking a yawn it indicates that the people be tired and want to sleep but the recent study proves that yawing help out people to work more efficiently. Because yawning happen when brain temperature increase, transfer chill blood to the brain serve up to keep best height of mental effectiveness.