Question

Why do we yawn? explain it briefly

Answer 1

A yawn is a reflex consisting of the simultaneous inhalation of air and the stretching of the eardrums, followed by an exhalation of breath.

Yawning (oscitation) most often occurs in adults immediately before and after sleep, during tedious activities and as a result of its contagious quality.[1] It is commonly associated with tiredness, stress, sleepiness, or even boredom and hunger. In humans, yawning is often triggered by others yawning (e.g. seeing a person yawning, talking to someone on the phone who is yawning) and is a typical example of positive feedback.[2] This "contagious" yawning has also been observed in chimpanzees, dogs, cats, birds, and reptiles, and can occur across species.[3][4] Approximately 20 psychological reasons for yawning have been proposed by scholars, but there is little agreement about its main functions.[1]

Answer 2

We yawn because the body has the deficiency
Of oxygen.
I read it somewhere
Hope it helps...