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Would be interesting to know why yawning induces sleep at all.

My psych pointed out that yawning is a tension release mechanism, so it’s likely just punting a bunch of cortisol from your nervous system

I use forced yawning to wet my eyes when they become dry, works better than any drops.

I do this as well. It is probably both a symptom and an initiator of certain sleep-associated changes in the body.