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Sleeping for more than ten hours a night - or fewer than six - may increase the risk of early death, new research has found.
This means eight hours exactly really might be the perfect amount after all.
Study - Women - Hours - Cent - Health
The study found that women who sleep for ten hours were 40 per cent more likely to have at least three health conditions linked to premature mortality.
These include a large waist, high blood pressure, elevated levels of fat or sugar in the blood.
Increase - Changes
These all increase changes of dying prematurely.
Previous research suggests both insufficient and excessive sleep causes inflammation in the body, which is linked to metabolic symptoms.
How the research was carried out
The researchers, from Seoul National University, analysed 133,608 people aged between 40 and 69 years old.
Participants - Average - Day - Year - Naps
The participants' were asked how long they spent asleep, on average, each day in the past year, including daytime naps.
Blood, DNA and urine samples were also collected.
The participants were considered to have metabolic syndrome if they had at least three of the following: a large...
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