Samenvatting
In a multiple regression analysis the relations between sickness in a period of three years, the subjective quality of sleep and fatigue during work and leisure time is studied. The study has been carried out among 104 bus drivers of the city of Groningen, Netherlands. Compared to the complaints of fatigue the quality of sleep is shown to be a fairly good predictor of sickness rate over a period of 1 to 2 years.