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Sleep length and quality, sleepiness and urinary melatonin among healthy Danish nurses with shift work during work and leisure time

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An Erratum to this article was published on 28 July 2009

Abstract

Background

Sleep problems are common effects of shift work. The aim of the present study was to evaluate how different types of shift affect sleep and sleepiness, and to relate sleepiness to urinary 6-sulfatoxymelatonin.

Methods

A total of 166 volunteer healthy Danish nurses working day, evening, or night, respectively fixed and mixed schedules were included. Self-reports of sleep were assessed together with real-time sleepiness and spot urine samples analyzed for 6-sulfatoxymelatonin on a workday and a leisure day.

Results

On a day off the nurses slept longer, with a better quality and reported less sleepiness compared to a workday. Nurses on nightshift reported poorer sleep quality than nurses on other shifts. Sleepiness was highest for nurses on mixed schedules. Concentrations of urinary 6-sulfatoxymelatonin and sleepiness were generally correlated except for nurses working fixed nights.

Conclusions

The poorest sleep quality was observed for nurses in mixed schedules working nights. The lack of correlation between sleepiness and 6-sulfatoxymelatonin on mixed night shift may indicate that the influence of endogenous melatonin is limited.

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Acknowledgments

The project was financed by the Danish Cancer Society and the National Institute of Occupational Health. Ulla Tegner, Anne Abildtrup, Dorrit Meincke, and Fía Lindenskov are acknowledged for technical assistance.

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Authors and Affiliations

  1. National Research Centre for the Working Environment, Lersø Parkallé 105, 2100, Copenhagen, Denmark

    Anne Helene Garde & Åse Marie Hansen

  2. Institute of Cancer Epidemiology, Danish Cancer Society, Copenhagen, Denmark

    Johnni Hansen

Authors
  1. Anne Helene Garde
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  2. Åse Marie Hansen
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  3. Johnni Hansen
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Corresponding author

Correspondence to Anne Helene Garde.

Additional information

An erratum to this article can be found at http://dx.doi.org/10.1007/s00420-009-0453-2

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Garde, A.H., Hansen, Å.M. & Hansen, J. Sleep length and quality, sleepiness and urinary melatonin among healthy Danish nurses with shift work during work and leisure time. Int Arch Occup Environ Health 82, 1219–1228 (2009). https://doi.org/10.1007/s00420-009-0419-4

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