Question

We yawn when we sleepy or drowsy.

Answer 1

Answer:

Hey!

Normally, people think that yawning is a sign of sleepiness or drowsiness. And it is. But, one also feels the urge to yawn too often when there is a lack of oxygen in the body, and when their blood pressure is low.

Answer 2

We yawn because it is a natural phenomena and often depicts sleepy and drowsy person .It helps to cool our brain and proper balance of gases in our body.

Thanks!