How Does Circadian Rhythm and Your Brain's Clock Work?

Your brain has a clock that helps you know when to be awake and when to sleep, like having a little alarm clock inside your head.

Imagine you have a friend named Circadian who lives in your brain. Every day, Circadian sends out signals to tell your body it’s time for bed or time to wake up. These signals work like a timer that goes tick-tock, tick-tock, and when the timer finishes, you feel sleepy.

Your brain has a special part called the suprachiasmatic nucleus, which is like the main clockmaker in your brain. It keeps track of time using light from outside. When the sun goes down, it tells your body to get ready for sleep. When the sun comes up, it says it’s time to wake up.

Your body has other parts that follow this rhythm too, like your stomach telling you when to eat or your heart beating a little faster in the morning.

It's like having a team of clock-makers working together all day long so you can sleep well and feel ready for the next day.