Link between sleep, breast cancer?

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Link Between Sleep, Breast Cancer?

http://video.msnbc.msn.com/nightly-news/47934588/

 Working shifts that cause circadian disruption may cause cancer of the breast

Night Shift Linked to Increased Breast Cancer Risk
Risk Higher Among 'Morning Larks' Working 'Night Owl' Hours

http://www.webmd.com/breast-cancer/news/20120529/night-shift-linked-increased-breast-cancer-risk

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