Yawning comes naturally to all human beings and even animals. We do it daily and it’s often contagious. But why do we yawn?
Scientific research and studies have shown that people tend to yawn more often when they are feeling sleepy or tired. Thus, many people believe we yawn because we’re sleepy, which is false. Yawning may occur anytime during the day or the night when the person is feeling tired or his/her brain is overheating. Through the yawn we inhale air, which eventually reaches our brains. A study shows that yawning occurs more frequently during wintertime, when temperatures outside are way lower than the ones in our body. Bringing cold air into your body results in cooling down your tired and overheated brain. This is why during summertime when the temperatures are high, yawning isn’t as frequent as during wintertime.
Another study shows that the body temperature is highest when the person is about to sleep and the brain is more tired, which results in frequent yawning.