BREAKING NEWS
Source: Thailand Medical News  Dec 15, 2019  2 years ago
Sleeping Longer Than 9 Hours Or Long Naps During The Day Increases Risk Of Strokes
Sleeping Longer Than 9 Hours Or Long Naps During The Day Increases Risk Of Strokes
Source: Thailand Medical News  Dec 15, 2019  2 years ago
Individuals who take long naps during the day or sleep nine or more hours at night may have an increased risk of stroke, according to a study published in Neurology, the medical journal of the American Academy of Neurology.



Also, individuals who took a regular midday nap lasting more than 90 minutes were 25 percent more likely to later have a stroke than people who took a regular nap lasting from one to 30 minutes. People who took no naps or took naps lasting from 31 minutes to one hour were no more likely to have a stroke than people who took naps lasting from one to 30 minutes.

Dr Xiaomin Zhang, MD, Ph.D., of Huazhong University of Science and Technology in Wuhan, Chin and study author told Thailand Medical News, "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 unfavorable changes in their cholesterol levels and increased waist circumferences, both of which are risk factors for stroke. In addition, long napping and sleeping may suggest an overall inactive lifestyle, which is also related to increased risk of stroke."

The research involved 31,750 people in China with an average age of 62. The people did not have any history of stroke or other major health problems at the start of the study. They were followed for an average of six years. During that time, there were 1,557 stroke cases.

All research participants were asked questions about their sleep and napping habits. Midday napping is common in China, Zhang said. Eight percent of the people took naps lasting more than 90 minutes. And 24 percent said they slept nine or more hours per night.

The research found that people who sleep nine or more hours per night are 23 percent more likely to later have a stroke than people who sleep seven to less than eight hours per night. People who sleep less than seven hours per night or between eight and less than nine hours per night were no more likely to have a stroke than those who slept from seven to less than eight hours per night.

The study findings were all adjusted for other factors that could affect the risk of stroke. These include high blood pressure, diabetes and smoking.

Individuals who were both long nappers and long sleepers were 85 percent more likely to later have a stroke than people who were moderate sleepers and nappers.

The medical r esearchers also asked people about how well they slept. People who said their sleep quality was poor were 29 percent more likely to later have a stroke than people who said their sleep quality was good.

About 1 percent of cases per person-years of the long nappers later had a stroke, compared to 0.7 percent of cases per person-years of the moderate nappers. The numbers were the same for the long and moderate sleepers, with 1 percent of cases per person-years compared to 0.7 percent of cases per person-years having a stroke.

Dr Zhang added, "These results highlight the importance of moderate napping and sleeping duration and maintaining good sleep quality, especially in middle-age and older adults.”

Dr Zhang noted that the study does not prove cause and effect between long napping and sleeping and stroke. It only shows an association. Limitations of the study include that information on sleep and napping was taken from questionnaires, not from recording people's actual sleep and information was not collected on sleep disorders such as snoring and sleep apnea. Also, the study involved older, healthy Chinese adults, so the results may not apply to other groups.

Source Reference: Zhou L, et al "Sleep duration, midday napping, and sleep quality and incident stroke: The Dongfeng-Tongji cohort" Neurology 2019; DOI:10.1212/WNL.0000000000008739.

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