Yawning isn't just about tiredness; it's your body's way of cooling your brain and increasing alertness. The act of yawning forces the muscles in the face and neck to move. Researchers believe this action may stimulate the carotid artery, raising heart rate and causing the release of wake-promoting hormones. #Yawning #BrainCooling #Alertness #WakeUp #HealthFact
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