Shift work is a reality of our modern economy. Services don’t stop running when the sun goes down. Without night workers—nurses and doctors, toll booth workers, security guards, policemen and women, truck drivers, pilots, and more—our world would grind to a halt. One of my closest friends works nights at a home for children. Most of his time is spent reading, but when the kids wake up or there’s an emergency, he is the first person on the scene. Without him, those kids wouldn’t be safe. But he pays a high price. Like many late shift workers, he suffers from terrible sleep-wake disruption, and is always either strung out or exhausted. After years of this strange schedule, he suffers from a host of physical problems. He has high blood pressure, struggles with his weight, and was just diagnosed with type 2 diabetes. He also has a lot of trouble with his relationship.