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Changes in the proportion of nurses within each work schedule category over time and changes in sleep medication use (with 95% CI) over time in a sample of Norwegian nurses (n=2028). Data from nurses who reported sleep medication use in the 1st wave (2008/2009) were excluded. The 2nd (2010/2011) and 11th wave (2020) did not include questions on sleep medication use (no questionnaire was administered in 2019).
