📰 News ⏱ 2 min

How Does Our Brain Keep Track of Day and Night? 🕒

Inside the brain there is a tiny region that works like a clock, telling us when it’s day or night.

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Key Points

4 points

The brain’s clock is known as the biological clock.

It runs on a twenty‑four‑hour cycle called a circadian rhythm.

Light from the eyes tells the clock when day changes to night.

Researchers study it to help people who have trouble sleeping.

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This clock follows a regular cycle that repeats about every twenty‑four hours, called a circadian rhythm.

Sunlight reaches the eyes and sends a signal to the brain, resetting the clock each day.

Understanding this helps doctors treat sleep problems and improve health.

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4 words

biological clock

a natural timer that tells the body when to sleep and wake

circadian rhythm

a daily cycle of about twenty‑four hours that controls many body functions

suprachiasmatic nucleus

a small part of the brain that acts as the main body clock

neurons

tiny brain cells that pass messages

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