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The sleep regularity index: a new way to evaluate shiftwork schedules

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dc.contributor.authorGuzzetti, J.R.
dc.contributor.authorMatsangas, P.
dc.contributor.authorBanks, S.
dc.contributor.authorShattuck, N.L.
dc.date.issued2025
dc.description.abstractSailors adhere to a variety of demanding shiftwork schedules (known as ‘watchbills’) which pose a challenge for sleep and wellbeing at sea. Previous research aimed at identifying viable watchbills based on how they protect sailors' sleep has largely relied on sleep duration. Findings have highlighted insufficient sleep during watchstanding but have mixed results when comparing across watchbills. Sleep regularity is another important dimension of sleep that has been rarely assessed during watchstanding. This study aimed to investigate sleep regularity assessment as a tool for evaluating watchbills, using a recently introduced metric—the Sleep Regularity Index (SRI). Two hundred eighteen sailors from different watchbills were assessed for approximately 1 week of an underway period. The median SRI score was significantly lower for the 5-h on/15-h off watchbill compared to all other watchbills, despite no statistically significant differences in daily sleep duration. The median SRI score was similar between fixed watchbills. The large measurable differences in SRI scores between watchbills, particularly when sleep duration was similar, demonstrated the value of sleep regularity assessment as a tool for evaluating watchbills.
dc.identifier.citationJournal of Sleep Research, online, 2025; online(1):1-11
dc.identifier.doi10.1111/jsr.70133
dc.identifier.issn0962-1105
dc.identifier.issn1365-2869
dc.identifier.urihttps://hdl.handle.net/11541.2/43761
dc.language.isoen
dc.publisherWiley-Blackwell Publishing
dc.rightsCopyright 2025 The author(s) (https://creativecommons.org/licenses/by/4.0/)
dc.source.urihttps://doi.org/10.1111/jsr.70133
dc.subjectmaritime defence
dc.subjectsleep restriction
dc.subjectsleep timing
dc.titleThe sleep regularity index: a new way to evaluate shiftwork schedules
dc.typeJournal article
pubs.publication-statusPublished
ror.fileinfo12304686610001831 13305999920001831 9917047267301831
ror.mmsid9917047267301831

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