How Does the Human Body Regulate Sleep Cycles?

The human body has a kind of clock inside it that helps you know when to sleep and when to wake up.

Imagine your body is like a robot with a built-in timer, this timer is called the circadian rhythm. It works like a little boss who tells your brain, “Time for bed!” or “Time to get up!”

Your brain uses something called melatonin, which acts like a sleepy signal. When it gets dark outside, your body starts making more melatonin, this is why you feel tired at night.

It's like when you're playing with your toys and the lights go off, you know it’s time to wind down and go to bed!

In the morning, light comes in through your eyes, which tells your brain to stop making melatonin. This is like a bright alarm clock that wakes you up, so you can start playing again!