Posted in January 2012

How Soon Do We Start Yawning?

Yawing is a universal sign for sleepiness and boredom. Yawns are also contagious — observing a person yawn creates an empathetic chain reaction in others. In general, researchers believe that yawning is an arousal mechanism. Some theories suggest that yawns flush carbon dioxide out of our bodies, and others that yawning cools the brain. Some … Continue reading