Why Do People Feel Sad When They're Tired?

When you're really tired, your brain gets a little grumpy. It's like when you've been playing with toys for hours and then suddenly feel sad because you can't play anymore. Your brain uses up energy to think, so when it runs out of energy, it starts feeling sad or even moodier than usual.

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Examples

  1. A child feels sad after a long day at school because they’re too tired to play.
  2. A person wakes up feeling gloomy even though they had a good night’s sleep.
  3. After working all day, someone sits on the couch and just feels like crying.

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