Not only is there such a thing as too much sleep, studies suggest it is very detrimental to your health.
A study by the American Cancer Society showed that people who slept too much had a higher risk of death over six years. Specifically, the risk of death increased 12 percent for people who slept eight hours, 17 percent for people who slept nine, and 34 percent for people who slept for ten hours a night.Oversleeping is linked to some medical problems, including diabetes and heart disease. However, the negative effects of oversleeping may also be caused by depression and low socioeconomic status. For instance, people of lower income may have less access to health care and thus suffer from more undiagnosed illnesses such as heart disease, which may cause oversleeping.
Oversleeping can also be a symptom of a medical disorder. For instance, people with hypersomnia suffer from excessive daytime sleepiness that is not usually relieved by napping. They tend to sleep for unusually long periods of time at night and experience anxiety, low energy, and memory problems as a result of their constant need for sleep.
Depression, use of alcohol and some prescription medications, and simply love for sleeping, are other possible causes of oversleeping.