Melatonin Release and the Body's Rhythm
The pineal gland regulates the body’s day-night rhythm through melatonin release. So when it gets dark and hardly any light reaches the eyes, it releases melatonin. Higher melatonin levels make us tired. Authors: 3sat/NANO/Logo (Marco Polo Film AG)/S. van Iersel, T. Visser, A. Scheurich/ Armin Rieg

