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A comment on Brain size drives differences in yawn duration across mammals and birds.

Re:Brain size drives differences in yawn duration across mam... by kruxigt on Sunday May 16, 2021 @05:34AM (#27172455)
Why do we need to cool our brains when we are tired and not for example when we are exercising or thinking hard or in a hot environment?
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Re:Brain size drives differences in yawn duration across mam... by exporectomy on Sunday May 16, 2021 @07:43AM (#27172992)
My totally made up guess is when we sleep our brains operate at a lower temperature than awake, regardless of activity. So to quickly transition from waking temperature to sleeping temperature, maybe yawning does a rapid cooling that's then maintained by normal slower-acting processes.
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Re:Brain size drives differences in yawn duration across mam... by op00to on Sunday May 16, 2021 @07:54AM (#27173033)
Maybe you are tired, and thus need to cool your brain.
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