Train and bus drivers, doctors and carers, employees in companies where machines run around the clock: In many industries, people work in shifts. Some start early in the morning, or at midday. Others ...

Shift work refers to any job that falls outside of a more “traditional” nine to five work schedule, affecting most people who start work before 6:30 a.m. or after 4:30 p.m. Millions of Americans are ...