Night shifts at work could lead to heart disease. A study of nurses who worked late night shifts found a link to cardiovascular health decline over a long period of time. “They found nurses who worked rotating night shifts for 10 years or longer had a 15 percent or higher increased risk of coronary heart disease compared to women who escaped night shift duty…For younger women, who started the study in their late 30s, those who worked night shifts for 10 years or longer had a 27 percent higher risk of heart disease.” While the exact cause for the correlation was not known, researchers suspect it could be credited towards lack of sleep and disrupting normal “biological rhythms” required for a healthy life.