Link between sleep and agressive breast cancers

Not getting enough sleep may be linked to more aggressive types of breast cancer.

A study reported in the journal Science Daily looked at medical records and surveys for more than 400 post-menopausal breast cancer patients.

Researchers found women who got six hours of sleep or less a night had a higher recurrence of tumors.

Researchers were unable to find a similar link in pre-menopausal women.

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