Question

Why do we yarn and sneeze ?

Answer 1

Explanation:

The conventional view is that when our body gets short of oxygen, for example because we're so tired that we're breathing slowly, the yawn reflex is triggered to make us draw in more air.

Answer 2

We yawn in order to obtain more oxygen, it usually occurs when we feel sleepy due to lack of oxygen,


We sneeze in order to remove a foreign particle such as dust enters our nostril.

Hope it helps :)