Achim Kramer is a chronobiologist and knows more about my body than I do. He saw through me down to the roots. Right down to the root of the hair, to be precise. I didn't have a leg, but at least pulled a hair out to better understand my internal clock.

In 2017, three American chronobiologists received the Nobel Prize in Physiology or Medicine for decoding this internal clock. They were able to show that different genes set the pace in animals or humans - which is why, for example, vital functions such as sleep, digestion, hormone release or blood pressure follow an individual day-night rhythm.

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