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Why do we sleep?

Monica Marin

Created on October 14, 2025

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Transcript

Why do we sleep?

Stages of sleep

Sleep consists 4 stages the deepest of which are known as slow wave sleep and rapid eye movment. For most of us sleep feels like a pause button were we jump on the bed shut our eyes and are bodys stop functioning.

https://www.youtube.com/watch?v=CoCL0IB4u4g

Why do we sleep?

We all have an internal biological clock that regulates our 24-hour sleep. We call them circadian rhythms.

https://www.youtube.com/watch?v=CoCL0IB4u4g

Cortisol and Melatonin

During the day, when there is light, your brain releases a hormone called cortisol, which keeps you awake up and going.As the sun sets and the night appears causing darkness your brain trigers the release of melatolin a harmone that makes you sleepy.