The researchers collected data from over 116,000 people who lived in 21 different countries around the world. They followed them for eight years and found that those who slept more than eight hours a night were more likely to experience a cardiovascular disease or death.

The researchers collected data from over 116,000 people who lived in 21 different countries around the world. They followed them for eight years and found that those who slept more than eight hours a night were more likely to experience a cardiovascular disease or death.