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People who sleep nine or more hours per night are 23 per cent more likely to later have a stroke than people who sleep seven to less than eight hours per night, warns a new study.
People who took a regular midday nap lasting more than 90 minutes were 25 per cent more likely to later have a stroke than people who took a regular nap lasting from one to 30 minutes, said the study published online in Neurology, the medical journal of the American Academy of Neurology.
"More research is needed to understand how taking long naps and sleeping longer hours at night may be tied to an increased risk of stroke, but previous studies have shown that long nappers and sleepers have unfavourable changes in their cholesterol levels and increased waist circumferences, both of which are risk factors for stroke," said study author Xiaomin Zhang of Huazhong University of Science and Technology in Wuhan, China.
The people were asked questions about their sleep and napping habits.
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Being overweight or obese increases general risk factors including type 2 diabetes, coronary heart disease, some types of cancer such as breast and bowel, and having a stroke.