What are the regulator of these rhythms?

The regulator of these rhythms is like a sleepy friend who makes sure everything happens at the right time.

Imagine you have a toy car that zooms around your room every morning. But it only works when your mom says, "Time to play!" That's like how our body knows when to wake up, because there's something inside us telling it, “It’s time!”

This sleepy friend is called the body clock or the circadian rhythm. It lives in a special part of your brain and keeps track of day and night. Just like how you know when to go to bed because your mom says, "Time for sleep!" your body knows when to be awake or asleep.

Sometimes, this sleepy friend gets tired or confused, maybe after a long weekend or too much screen time. That’s why you might feel grumpy in the morning or extra energetic at night. It's like your toy car suddenly starts zooming around at bedtime!