Why people yawn when they are sleepy? Are there any biological reasons behind yawning?
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I thought it like pressure washed your brain which can help clean broken down neurotransmitters from your synapses . I kinda notice a sort of rumble/vibration when I yawn and usually feel more clear headed after. The same thing happens in sleep to here’s a science article https://pubmed.ncbi.nlm.nih.gov/23813685/#:~:text=When%20this%20network%20is%20active,accumulating%20in%20the%20cerebrospinal%20fluid.
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