this post was submitted on 16 Jun 2024
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there are quite a lot of articles about yawning cooling the brain. in this princeton research they observed how much people yawn outdoors in the winter vs summer, and it was more common in winter. personally i don't quite believe this, because aren't we more tired in the winter anyway? https://www.princeton.edu/news/2011/09/19/more-sign-sleepiness-yawning-may-cool-brain