Yawns happen when we’re tired because our brain needs more oxygen. Imagine you’ve been sitting in class for a long time and your brain feels sleepy. You yawn to take a big breath, which helps wake your brain up. Sometimes, seeing someone else yawn makes you yawn too, it’s like a signal that says, “Hey, I’m tired!”
Examples
- A student yawns in class because he’s been sitting for too long.
- Your friend sees you yawn and starts yawning too.
- A baby yawns while lying on the floor, clearly sleepy.
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See also
- Why Do People Yawn When They’re Bored or Tired?
- Why Do Humans Get Bored?
- Why Do Humans Yawn When They’re Tired?
- Why Do People Yawn When They Are Tired?
- What Causes ‘Jet Lag’ and How Can We Fix It?