Yawning is commonly linked to feelings of tiredness or boredom. However, many people believe that yawning serves a functional purpose beyond these associations.

One popular theory suggests that yawning helps to increase oxygen levels in the body. When we yawn, we take a deep, involuntary breath, which can enhance oxygen intake and improve circulation.

Despite these beliefs, the exact reason why we yawn is still not fully understood by scientists. Nonetheless, yawning remains an intriguing and universal behavior observed across many species.
https://www.newsbytesapp.com/news/lifestyle/does-yawning-increase-oxygen-levels-here-s-the-truth/story