That's not completely random.

Your body has an internal 24-hour clock called the circadian rhythm.

It helps control things like when you feel sleepy, when you feel awake, your body temperature, hormone release and even parts of your digestion.

And here's the interesting part:

Your body doesn't just use the clock on your phone to know what time it is. 😂

Light is one of its biggest clues.

When your eyes detect light, especially in the morning, signals are sent to the brain that help tell your body:

“Okay, it's daytime. Time to wake up.” ☀️

As it gets darker, your body starts preparing for sleep. A hormone called melatonin normally rises in the evening, helping your body feel more ready for rest.

That's why suddenly spending all night under bright screens can make your normal sleep schedule feel completely messed up.

Your body is basically running its own schedule in the background...

even when you don't realise it. 😭

And this internal clock isn't only about sleeping.

It influences a surprising number of processes throughout the day, which is why keeping a fairly regular sleep schedule can be important for your overall wellbeing.

Quick fact: Your circadian rhythm is an internal biological clock that follows roughly a 24-hour cycle and helps coordinate sleep, wakefulness and many other body processes.