A study links a lack of sleep with more aggressive breast cancer. At University Hospitals Case Medical Center in Cleveland, Cheryl Thompson saw that in data on 101 women with breast cancer, who were asked about their average sleep hours.
These more dangerous tumors were more common among women who reported 6 hours or less of sleep per night.
Thompson says more data are needed to discover what accounts for the association, but she says 7 to 8 hours of sleep should still be a good thing.
The study in the journal Breast Cancer Research and Treatment was supported by the National Institutes of Health.