Change is a constant ingredient of modern work life. Thus, job demands and the complexity of job tasks that workers are required to accomplish and perform in everyday work are increasing in organizations and firms. Increasing job demands and incessant changes may be stressful, at least for certain employees, and cause significant and long-lasting health effects as well. Most individuals spend a substantial portion of their total time at work. Thus, work-related behaviours have significant spillover effects on other aspects of life. For these reasons, work-related sickness is also a particularly important aspect of employee well-being from the broader economic perspective.