A study conducted by the University of Warwick and Federico II University Medical School, Italy, provides evidence of the direct link between short duration of sleep and an increased chance of dying prematurely.

People who sleep for less than six hours each night were 12 percent more likely to die prematurely as compared to those who get the recommended six to eight hours.
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The research also notes that consistent overlong sleeping (over nine hours a night) can be a cause for concern.While,unlike short sleeping, overlong sleeping does not in itself increase the risk of death, it can be a significant marker of underlying serious and potentially fatal illnesses.