Wearables offenbaren die glücklichsten Schlafzeiten: In einer Studie, die mit 2.077 Fitbits über einen Zeitraum von vier Monaten durchgeführt wurde, haben Untersuchungen Zusammenhänge zwischen Stimmung, Depression und Störungen des Tagesrhythmus festgestellt

> “It’s not just, ‘If you go to bed earlier, you will be happier,’” said Lee, who is an undergraduate researcher and a 2023 Goldwater Scholar. “To some degree, that will be true, but it will be because your sleep schedule is aligning with your internal rhythms.’”

>The team was able to extract telling features, or biomarkers, of three different important patterns.
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>There was the central circadian clock, which keeps time in the suprachiasmatic nuclei of the brain. It also coordinates peripheral circadian clocks in other parts of the body. In its study, the team analyzed the peripheral clock in the heart.
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>For a typical person, the heart knows that it needs to be ready to be more active at 2 p.m. than at 2 a.m. thanks to its peripheral clock, Forger said.
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>The final pattern the team could measure was the interns’ sleep cycles.
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>The team found that, generally speaking, having a sleep cycle out of sync with the peripheral circadian clock—that is, what time your heart thought it was—had a negative effect on mood.
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>When a person’s central circadian rhythm was out of whack with respect to their sleep cycle, however, a negative effect was seen when an intern was doing shift work. That is, the misalignment between their sleep and central internal clock was driven by their occupation.
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>And when this mismatch was affecting mood, its effect was more pronounced than in the peripheral mismatch case.
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Paper: [The real-world association between digital markers of circadian disruption and mental health risks | npj Digital Medicine](https://www.nature.com/articles/s41746-024-01348-6#Sec8)

How to measure and align to a good cycle myself?