Question

Why do we yawn if someone is yawning ​

Answer 1

Explanation:

The brain thermoregulation theory suggests that yawning is yet another mechanism to help cool your body down — specifically, to cool your brain down.

Answer 2

Answer:

This is known as contagious yawning.

Explanation:

The main reason for yawning is to cool the body temperature and brings more oxygen to the body.

And based on the trigger for yawning is

a) Spontaneous  yawning : Which occurs naturally

b) Contagious yawning : when others yawning.

Still is is puzzle why the contagious yawning occurs there are several hypothesis are present but none of them are conclusive yet.