From the Introduction: "The National Institute for Occupational Safety and Health (NIOSH) and the Occupational Safety and Health Administration (OSHA) recognize that healthcare workers and responders involved with cases related to Ebola in the United States may be required to work longer or unusual shifts. This can involve extended shifts (more than 8 hours long), rotating or irregular shifts, or consecutive shifts resulting in more than the typical 40-hour work week. Long work hours may increase the risk of injuries and accidents and can contribute to poor health and worker fatigue. Additionally, the personal protective equipment (PPE) required for working with Ebola patients can increase workers' core body temperature, contributing significantly to fatigue. Although these guidelines are geared toward workers responding in the United States, the same concepts apply to those working in other countries."
Centers for Disease Control and Prevention: https://www.cdc.gov/