Question

what is the reason of yawning?

Answer 1

main reason is lack of oxygen and water content in ur body mate

Answer 2

hey!! here is your answer ✍✍✍

yawning most occurs in adults immediately before and after sleep, during tedious activities and as a result of its contagious quality. it is commonly associated with tiredness, stress, sleepiness, or even boredom and hunger.

in scientific way,
low oxygen levels in the Paraventricular nucleus (PVN) of the hypothalamus of the brain can induce yawning.

hope u got your answer ☺☺