Andrew Huberman· PhD
And that clock is in-trained, meaning it is matched, to the external light-dark cycle, which is no surprise, 24 hours.
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The evidence is convergent. Multiple independent sources reach the same conclusion, the underlying mechanism is well-characterized, and even the field's most cautious voices treat it as worth doing.
And that clock is in-trained, meaning it is matched, to the external light-dark cycle, which is no surprise, 24 hours.
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This is a biological fact. It is right down to our DNA. We actually have genes in every single one of our cells that ensure that every cell is on this 24 hour-ish rhythm, close to 24 hours. We have a clock over the roof of our mouth, a group of neurons called the suprachiasmatic nucleus. That clock generates a 24 hour rhythm.
Now what we know is every cell in your body has clocks in it and many multiple clocks.
The timing of these rhythms are dependent on basically this system in the brain called the suprachiasmatic nucleus, which is synchronizing with the light-dark cycle of the environment. And so, then, we have what are called clock cells within every tissue and cell in our body.