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May 10, 2026SLEEP

0358 Seasonal Rhythms in Wearable-Derived Sleep Across U.S. Latitudes

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Authors

KRK. RossKPKarina Pereira‐LimaKSKerby Shedden

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Overview

Randomized trial shows annual rhythmicity in total sleep time in medical residents, indicating circannual patterns.

Key Points

  • This study aims to determine if humans display annual sleep patterns influenced by geographic location.
  • Analyzed yearlong wearable sleep data from first-year medical residents in the Intern Health Study (2018–2022).
  • Used cosinor models to test for annual seasonality and mixed-effects models to assess latitude effects.
  • Examined daily total sleep time (TST) and sleep midpoint for rhythmicity and variation across latitudes.
  • Both total sleep time (TST) and sleep midpoint exhibited annual rhythmicity.
  • TST peak was greater and occurred earlier at higher latitudes, but average TST did not differ significantly.
  • Sleep midpoint amplitude and phase showed no significant variation across different latitudes.

Cite This Study

Ross et al. (2026) studied this question.

synapsesocial.com/papers/6a0021b7c8f74e3340f9ca05https://doi.org/10.1093/sleep/zsag091.0358
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