Your body has a little clock inside it. It tells you when to be awake and when to sleep, like a tiny timer in your head! This clock is affected by light, when the sun goes down, your body starts feeling sleepy, and when it comes up, you feel more alert.
Examples
- A child goes to bed when it gets dark, just like their parents.
- An office worker feels tired at night and wakes up when the sun comes out.
- A cat sleeps during the day and is active at night.
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See also
- How Does the Human Body Tell Time?
- How Do Plants Know When to Grow in Spring?
- How Do Birds Know When to Migrate?
- Why Are Some People ‘Night Owls’ and Others ‘Early Birds’?
- What Happens to Our Bodies During a Full Moon?
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