Why is yawning contagious?

Why is yawning contagious?
 

Did you yawn when you read that?
Yawn is an involuntary reflex to having less oxygen in our body than we require.
If you are bored or tired your breathing will slow down which will cause you to take in less oxygen and so your body will trigger a yawn to help breathe in more.
It has also been suggested that yawn is a way of cooling your brain, to avoid the brain overheating.
In short, more people yawn in summer than in winter.
It is a way of increasing your heart rate blood flow and the use of muscles in the face which all help cool down the brain.
Your brain is more likely to overheat when... read more

 
31 August 2017 in Lifestyle, Views: 44
Source: Metro
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