To study the relation between work and background factors on the one hand and disturbed
sleep and fatigue on the other.
A representative national sample of 58,115 individuals was selected at regular intervals
over a period of 20 years and interviewed on issues related to work and health. The
data were subjected to a multiple logistic regression analysis.
The number of cases was 18,828 (32.8%) for fatigue and 7347 (12.8%) for disturbed
sleep. For disturbed sleep, the significant predictors became: female gender, age
above 49 years, present illness, hectic work, physically strenuous work, and shift
work. For fatigue, the significant predictors became female gender, age below 49 years,
high socioeconomic status, present illness, hectic work, overtime work, and physically
Work stress, shift work, and physical workload interfere with sleep and are related