Do you sleep too much or do you not get sufficient sleep? If so, there is bad news. The amount of time you sleep, including daytime naps, is associated with the risk of developing cardiovascular disease (CVD) and death, a new study warns. The study found that people who slept for longer than the recommended duration of six to eight hours a day had an increased risk of dying or developing heart disease or stroke.

"Our study shows that the optimal duration of estimated sleep is six to eight hours per day for adults," said Chuangshi Wang, postdoctoral student from the McMaster University in Canada.