From the article: “SRI captures day-to-day variability in bedtime, wake-up time, sleep duration, and awakenings during sleep.”

This has nothing to do with when you sleep, it’s about variability.

>The term "shift work" includes both long-term night shifts and work schedules in which employees change or rotate shifts.

[0] https://en.wikipedia.org/wiki/Shift_work

Although you’re probably right in the context of this study, I highly suspect when you sleep does affect things due to the evolutionary and biological significance of the circadian rhythm.

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