Why Do We Have ‘Mood Swings’ When We’re Tired?

When you're tired, your brain gets a bit lazy. It can't think clearly anymore, and that makes you feel grumpy or sad. Imagine your brain is like a robot, when it runs out of battery, it starts acting weird.

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Examples

After a long day at school, you snap at your brother over something tiny.
You’re sleepy on the bus and start crying because someone talked to you.
Your mom says one thing, but you take it as an insult and get angry.

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Categories: Health · mood swings,brain function,sleep,fatigue