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April 3, 2026npj Biological Timing and SleepOpen Access

Field assessment of melatonin timing reveals circadian misalignment beyond chronotype in elite female football players

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Authors

CRCatia ReisRTRita TomásVCVasco Cardoso

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Overview

Finds correlations between circadian timing, sleep duration, and well-being in elite female athletes, suggesting individualized interventions may help.

Key Points

  • The main aim is to assess circadian misalignment in elite female athletes and its link to well-being.
  • Monitored twenty-two elite female athletes during a one-week training camp.
  • Used actimetry devices to measure sleep patterns and light exposure.
  • Collected hourly saliva samples for melatonin assessment around habitual sleep onset.
  • Administered daily sleep diaries including well-being ratings.
  • Longer phase angle between melatonin onset and sleep onset linked to longer total sleep duration.
  • Evening chronotype and dissimilar roommate chronotype both associated with shorter sleep duration.
  • Morning melatonin elevation related to lower subjective well-being.

Cite This Study

Reis et al. (2026) studied this question.

synapsesocial.com/papers/69cf5d1f5a333a821460abefhttps://doi.org/10.1038/s44323-026-00074-4
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