There was an article posted recently about a new discovery around CSF flows during sleep too. It sounds like yawning causes similar flows, which could maybe exp

There was an article posted recently about a new discovery around CSF flows during sleep too. It sounds like yawning causes similar flows, which could maybe explain why you yawn more when tired? It could be a compensation mechanism to provide a bit of the same effect you normally get when sleeping. https://news.ycombinator.com/item?id=45771636 https://news.ycombinator.com/item?id=45771636