Night Shift Linked to Sleep Problems in Younger Workers

Working the night shift interferes with sleep, particularly for workers in their 30s and 40s, according to a study in the April Journal of Occupational and Environmental Medicine, the official publication of the American College of Occupational and Environmental Medicine (ACOEM).

However, the sleep problems don’t appear to get worse over time — perhaps because young workers who have a lot of trouble with sleep issues are more likely to quit shiftwork, according to a study led by Philip Tucker, Ph.D., of Swansea University in Swansea, Wales.

Using a large employment database, the researchers looked at the relationship between shiftwork and sleep problems in workers of different ages and over time. As in previous studies, shiftworkers had a higher rate of sleep problems than day workers. Shiftwork was specifically related to waking up too early rather than other types of sleep problems.

The effects were most apparent in the early to middle years of working life — workers in their 30s and 40s. Former shiftworkers had more sleep problems than those who had never done shiftwork. However, more years of shiftwork did not lead to greater sleep problems. Instead, workers who gave up shiftwork seemed to be a “self-selected” group who tended to have more problems with shiftwork.

The study confirms the previously reported link between shiftwork and sleep problems, while lending new insights into the course of those problems over time. Sleep problems seem to be a “reversible consequence” of shiftwork — although it may take awhile after giving up shiftwork before sleep returns to normal.

For more information, visit ACOEM’s Web site, www.acoem.org.

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