Background: With the expanding demand for a 24-hour society, the prevalence of sleep deprivation and
other sleep-related health problems is increasing. Shiftwork is an occupational health risk of growing significance
because of its high prevalence and because of its potential role as a determinant of
socioeconomic-related health disparities.
Aims: The aim of this study was to examine the associations of shiftwork with overweight status and type 2
diabetes and explore whether a history of sleep problems mediates or modifies these associations.
Participants and methods: A cross-sectional study was conducted among 1593 participants in the Survey of
the Health of Wisconsin (2008-2012) who were employed and reported work characteristics (traditional
schedule or shiftwork), sleep habits and history of sleep problems (insomnia, insufficient sleep, and
wake time sleepiness). Objective measures of body mass index and type 2 diabetes were used.
Results: Shiftworkers were more overweight than traditional schedule workers (83% vs 71% with body mass
index ≥25) and reported more sleep problems, such as insomnia symptoms (24% vs 16%), insufficient sleep
(53% vs 43%), and sleepiness (32% vs 24%). The associations between shiftwork and being overweight or diabetic
were stronger among those reporting insufficient sleep, but the interaction was not statistically significant.
Conclusions: Shiftworkers face disparities in metabolic health, particularly those with insufficient sleep. Improved understanding
of the relationship between sleep and metabolic states can inform health care providers' and employers'
efforts to screen high-risk individuals and intervene with workplace wellness initiatives to address these disparities.
© 2015 National Sleep Foundation. Published by Elsevier Inc. All rights reserved