Take a nap. But not for long. Eat a meal. No, just eat a snack. This is some of the varied and often contradictory advice shift workers receive to help them stay alert and safe on the night shift. But research suggests some of this advice is not only confusing, it’s outdated. It could also lead shift workers to feel more groggy and less alert. So, what does the evidence say about when to sleep and what to eat to stay safe at work? And what practical things can shift workers do, not only for their own health but for the safety of others?