Yawning is usually associated with feeling drowsy and needing sleep. However, you hardly know what happens in your body when you yawn. In fact, yawning is not only an automatic reaction, but something extremely useful for the body
The need to yawn arises when there is a lack of oxygen in the brain. Thus, in practice, an emergency aid mechanism is launched, which supplies the brain cells with the necessary dose of oxygen. In this way, it protects it from overheating.
The act of yawning activates the brain and has an invigorating effect, especially when you are tired. It happens most often with overwork, boredom or monotonous work. Yawning delivers a large dose of oxygen and increased blood flow, which activates the brain. However, its effect is temporary, and if you don't get enough rest, you'll continue to yawn.
In the opposite case - the lack of desire to yawn speaks of a mental illness. As a rule, if someone yawns in front of us, it is contagious and we inevitably yawn too. However, if a response is not triggered in our country, this is a sign of disturbed social mechanisms of adaptation and mental illnesses such as schizophrenia or autism, for example.
Yawning prevents even pneumonia, because the lower parts of the lungs are involved, and they do not work under other conditions. The mechanism allows to strengthen the respiratory system and prevent different types of flu conditions.
An interesting fact is that even children in the mother's womb also yawn. The phenomenon is observed from the 12th week of pregnancy. In this way, the development of the cerebrum is most likely stimulated.