Do you know anyone who likes to lie in? Perhaps especially over the holidays? Well it's bad news for them, as it turns out that sleeping too much could be bad for you.

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The new study from the University of Sydney has a surprising finding for those of us who hate to get out of our beds: regular oversleeping can have adverse health effects. In addition to the regular taboos of drinking too much, smoking, eating poorly, and too much sitting, researchers have found that sleeping more than nine hours a day can be harmful.

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Over a six year period, regular oversleeping meant a 44% increased risk of death. Surprisingly, sleeping less than seven hours a day meant a 9% increased mortality risk. So, sleeping less is better than sleeping more - at least according to this study.

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