Lack of sleep is now being linked to more aggressive types of breast cancer. That's according to a study reported in Science Daily.
The research team looked over medical records and surveys from more than 400 post menopausal breast cancer patients.
They were all asked about their sleep patterns in the last two years.
Researchers found that women who got six hours of sleep or less each night had a higher recurrence of tumors. They were unable to find a similar link in pre-menopausal women.
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