Why people yawn when they are sleepy? Are there any biological reasons behind yawning? 652 viewsJanuary 1, 2024 Question98.79K May 24, 2023 0 Comments Why people yawn when they are sleepy? Are there any biological reasons behind yawning? In: 299 26 Answers ActiveNewestOldest Anonymous Posted May 24, 2023 0 Comments I was informed that it was that your Brain was low on O2 ,and by yawning you breathe in a lot more than normal..therefore kick starting your brain ..? You are viewing 1 out of 26 answers, click here to view all answers. Register or Login
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