The Worst Work Hours for Your Health

Bad news if you burn the midnight oil: People who regularly work night shifts are twice as likely to have diabetes, finds new research from the University of Pittsburgh.

And the risk remains even after they've retired and returned to a normal sleeping schedule.

How come? Previous research shows that messing with your biological clock and limiting sleep can lead to decreased resting metabolic rates and increased blood glucose concentrations, which set the stage for diabetes and other diseases, says study author Timothy Monk, Ph.D.