Although we usually think that we yawn before going to bed or when we wake up in the morning, sometimes we realize that we yawn when we are in a very important meeting or when we are telling something to our friend.
Although we usually think that we yawn before going to bed or when we wake up in the morning, sometimes we realize that we yawn when we are in a very important meeting or when we are telling something to our friend.
Yawning can be one of the most common activities we do every day. But have you ever wondered why yawning happens? Yawning has long been …
