The article analyses the impact of working time on two outcomes: sickness absence and the work-family balance. Working time is distinguished along two dimensions: irregular versus regular working hours and control versus no control over working time. There are three main findings. First, working irregular working hours with no control over time increased sickness absence, for men. Second, irregular hours, particularly with no flexibility, caused distress to the workfamily balance, for both women and men. Third, flexibility in the work schedule when working regular hours had no effect on sickness absence nor on the work-family balance. This last finding may be explained by the institutional setting: employees in Norway already have substantial flexibility in, for instance, access to leave of absence. The findings suggest that increasing flexibility may benefit employees who work irregular hours.