Why people yawn when they are sleepy? Are there any biological reasons behind yawning?
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When we’re tired, our brains need more oxygen to stay awake and alert. Oxygen is like fuel for our bodies and helps our brains work well. Yawning helps us take in more oxygen and wake up our brains.
But that’s not all! Yawning also helps our bodies get rid of something called carbon dioxide. Carbon dioxide is a waste gas that builds up inside our bodies when we’re not breathing deeply enough. Yawning helps us get rid of that extra carbon dioxide and feel more refreshed.
Sometimes when you see someone yawn, it can make you yawn too! It’s like a contagious feeling. Scientists think it happens because our brains are really good at copying what other people do. So when we see someone yawn, our brains tell us to yawn too, even if we’re not sleepy. It’s kind of funny, isn’t it?
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