Scary Truths about the Graveyard Shift -- "This disruption in life's routines might be why divorce rates are as high as 60% among all-night workers, and why they have 150% more stress-related gastrointestinal disorders. Health-care coverage adds a further $28.8 billion to the corporate bill, according to Circadian. Then there's the high turnover rate for night-shift employees, as high as 300% annually in some industries."