A simulation study in 2017 showed anesthesia residents performed worse when sleep-deprived after working a night shift. In this quantitative study of more than 5,000 European anesthesiologists, participants reported that working night shifts reduced their quality of life and put their patients at risk. Few reported institutional support (e.g., training, fatigue monitoring) for night shift workers. Importantly, this study reports on perceived risk to patients, not actual patient risk.