Summary
It works like a tiny clock inside your head that follows the sun.
The timer helps you feel hungry, sleepy, and full of energy at the right times.
Scientists study this timer to help people feel better.
Key Points
3 points1
The brain’s timer is called the biological clock.
2
It follows a pattern that repeats every twenty‑four hours.
3
Light from the sun tells the clock when day turns to night.
New Words to Learn
3 wordsbiological clock
a natural timer inside living things
circadian rhythm
the regular cycle of day and night that our bodies follow
neurons
tiny cells in the brain that send messages
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