Seven hours the magic number for sleep: study

People who sleep more or fewer than seven hours a day, including naps, are increasing their risk for cardiovascular disease, a United States study shows.

Sleeping fewer than five hours a day, including naps, more than doubles the risk of being diagnosed with angina, coronary heart disease, heart attack or stroke, the study conducted by researchers at West Virginia University's (WVU) faculty of medicine and published in the journal Sleep says.

The study found sleeping more than seven hours also increases the risk of cardiovascular disease.