Oversleeping

According to a study on the sleep habits of 400,000 Taiwanese adults, the risk of coronary heart disease is about the same in people who sleep less than 4 hours a night as it is in those who sleep more than eight hours a night. Subjects who underslept had a 35% higher risk of heart disease, and people who overslept had a 34% increase. Another study, published in 2009, followed 276 subjects for six years and found that people who slept either less than 7 hours or more than 8 hours were at least twice as likely to develop type 2 diabetes or trouble tolerating glucose. And there's more: A 2013 study of about 54,000 adults over the age of 44 found links between too much sleep and increased rates of heart disease, diabetes, obesity, stroke, and mental health issues. In fact, the rates of coronary heart disease, diabetes, and stroke were even higher in people who overslept than in those who slept too little. So, the links are there. Sleep correlates with all kinds of health problems. But it's hard to say whether too much sleep actually causes these issues. It's totally possible that oversleeping is actually a symptom of things like depression or heart disease, or that there's some other connection. Either way, consistently sleeping too much might be a bad sign.