ඈනුම බෝවෙන්නෙ මෙන්න මෙහෙමයි : Why is yawning contagious
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We yawn when we feel fatigue, hungry, sleepy, tired or get stressed. You have to know that the yawning is not limited to human. It can be seen in the animal world too. In examples in dogs, horses like mammalians.
Yawning is contagious. But it contagious only in primates and dogs. We can see non-contagious state in child and infants younger than 5 years of age. This video discusses about the yawning and will make you some sense about why is yawning contagious.