The Circadian Rhythm: How Your Internal Clock Actually Works

Why do you feel a sudden crash of exhaustion at 3 PM? Why is it so hard to wake up in the dark? The answer lies deep inside your brain, in a tiny cluster of 20,000 cells called the Suprachiasmatic Nucleus. In Episode 2 of The Science of Sleep & Recovery, we explore the biology of your Circadian Rhythm—the 24-hour internal clock that controls your sleep, energy, and hormones. Learn how light exposure controls your melatonin and cortisol levels, why looking at your phone at night confuses your brain, and how you can use morning sunlight to hack your energy levels for the rest of the day.