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Sleeping more, less than 7 to 8 hours may raise mortality, CVD risk

UK researchers analyzed data from studies involving more than 3 million individuals and found that sleeping outside the seven-to-eight-hour duration nightly was associated with a higher risk of death and cardiovascular disease. The findings, published in the Journal of the American Heart Association, showed that sleeping more than the recommended duration was linked to worse outcomes compared with shorter sleep and that having poor sleep quality may raise the risk of coronary heart disease by 44%.

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