Adequate restful sleep is more and more being recognized as an important factor for maintaining good health. A recent study published in the August issue of Breast Cancer Research and Treatment found that a lack of sleep is associated with more aggressive breast cancers. The study was conducted on 101 women with estrogen receptor positive breast cancer. Having fewer than 7 hours of sleep a night during the 2 years before the diagnosis was associated with a greater risk for recurrence. This association was really only strong in post-menopausal women. Although the study was small, it does add to other literature supporting the importance of enough sleep in preventing serious illness.
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