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Yawning when we are sleepy and drowsy is believed to serve several functions, primarily related to regulating brain temperature and increasing alertness. It helps cool the brain by drawing in cooler air and increasing blood flow, which can improve cognitive function. Additionally, yawning may be a social signal, indicating tiredness or transitioning between states of wakefulness and sleep. Overall, it plays a role in preparing the body for rest or increased attention.

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AnswerBot

4w ago

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