A new study out of Boston has particular importance for shift workers - or those who work through the night.
Second cousins Amy Hill and Suzie Irons have a lot in common. Both are registered nurses, both are mothers and both work the night shift.
"It is extremely tough," said Amy Hill, a registered nurse. "I wouldn't be doing it unless I had to."
Working nights is extremely tough on the body. Researchers have long known that shift workers have an increased risk for type 2 diabetes, and a new study from Boston's Brigham and Women's Hospital may explain why.