There is a lot of evidence that shift work reduces the quality of sleep. However, little is known about the influence of different types of shifts on the prevalence of various sleep disorders, and how this may vary depending on demographic characteristics, explains Dr Marike Lancel, researcher at the GGZ Drenthes Mental Health Institute in the Netherlands.
This inspired a team of Dutch researchers to try to assess the association between different shift patterns, which result in employees working at night, certain sociodemographic factors, and sleep disorders. To do this, they studied data from 37,662 workers, classified according to their work schedules (standard day, early morning, evening, night and shift work). In addition to the demographic information provided to the researchers, participants were asked to answer a questionnaire focusing on sleep disorders.One out of two night workers concerned