Your Body's Clock and the Science of Sleep

Most people think sleep is just a time when nothing happens.

In fact, while you are sleeping, your body is doing important work.

Deep inside your brain, a small group of cells acts like a clock.

This clock controls your body's rhythm over each twenty-four-hour day.

When morning light reaches your eyes, the clock tells your body to wake up.

As evening comes and the light fades, it makes you feel sleepy.

This daily pattern is called your circadian rhythm.

If you stay up late looking at a bright screen, your clock gets confused.

It may think the day is still going, so falling asleep becomes hard.

People who keep changing their sleep times often feel tired during the day.

To help your clock work well, try going to bed at the same time each night.

Also, get some natural light in the morning, which helps your body know the day has begun.

Small habits like these can make a real difference to how you feel.