Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International ConferenceDec 3, 2025

Circadian rhythms may affect sleep quality in shift workers.

Circadian Biology Weekly Brief ↗PubMed ↗DOI ↗

Updated Jan 1, 2026

Abstract

The circadian rhythm phase of core body temperature was delayed by 46±33 minutes after night shift work.

Night shift work is associated with a delay in circadian rhythm.
Subjective sleep quality worsened following night shift work.
There appears to be a relationship between delayed circadian phase and poorer sleep quality.

Simplified

The phase shift of circadian rhythm by night shift work has caused concern since it may lead to mental and physical disorders. In this study, we estimated the circadian rhythm phase of core body temperature (CBT) in nurses working night shifts and verified whether phase shift occurred after night shift work. We also investigated the relationship between circadian rhythm phase shift and subjective sleep quality. The results showed that the circadian rhythm phase was delayed 46±33 minutes and subjective sleep quality worsened after night shift work. Our findings suggest an association between delayed circadian phase and poorer subjective sleep quality. We hope that our study will contribute to improving the sleep of shift workers.Clinical RelevanceThis study suggests that a relationship exists between delay of circadian rhythm and decline of subjective sleep quality. Understanding this relationship may reduce sleep problems caused by night shift work.

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Circadian rhythms may affect sleep quality in shift workers.

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