The Body's Clock at Night

Your body follows a clock inside you.

It tells you when to sleep and when to wake.

This clock works with light from the sun.

In the morning, bright light tells your brain to start the day.

At night, when it gets dark, your body makes a special chemical called melatonin.

This chemical helps you feel sleepy.

If you look at a phone in bed, the screen's light can slow the melatonin down.

Then your body clock gets confused, and you may lie awake for a long time.

So keep your room dark and put your phone away before sleep.

A dark, quiet room helps your body clock work well.