Why people yawn when they are sleepy? Are there any biological reasons behind yawning?
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>The biomedical hypothesis proposed here is that the immediate trigger for a yawn is a restricted collapse of a few alveoli in the lungs. A more extensive form of alveolar collapse is termed atelectasis and this involves a serious state of hypoxia which, if deepened or prolonged, can be fatal. Therefore, if the hypothesis is correct, yawning may prevent the development of atelectasis and save lives.
Lack of oxygen and sleepines are closely related
>When your body is low on oxygen, you feel tired. Fatigue comes more quickly when your lungs can’t properly inhale and exhale air.
Too much CO2 makes you sleepy
>Hypercapnia can be chronic (long-lasting) and cause symptoms like shortness of breath (dyspnea) and daytime tiredness or fatigue
Yawning is making sure you feel tired because you **are** tired and you’re not just falling asleep because you’re not breathing well enough. This wouldn’t end well
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