The Journal of the American Heart Society has released a new research paper that suggests sleeping too much may have a negative impact on health and mortality, reports Inquisitr.

The study found that people who sleep 10 hours a day or more are 30 percent more likely to die prematurely than people who get the standard eight hours. The risk for stroke and cardiovascular disease may also increase.

However, the results of the research are not entirely clear when it comes to causation and correlation. As CBS News medical contributor Dr. Tara Narula explains, the study might not be taking into account underlying conditions. Medical issues such as anemia, sleep apnea, and depression can contribute to a person sleeping longer hours and could be what the results are really telling researchers.