Darkness, melatonin may stall breast and prostate cancers | Science News

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Darkness, melatonin may stall breast and prostate cancers

New studies suggest people need to respect the body’s desire for nighttime darkness

6:57pm, January 23, 2009

To stay healthy, the body needs its zzz’s. But independent of slumber, human health also appears to require plenty of darkness — especially at night. Or so suggests a pair of new cancer studies.

One found that among postmenopausal women, the lower the overnight production of melatonin — a brain hormone secreted at night, especially during darkness — the higher the incidence of breast cancer. The second study correlated elevated prostate cancer incidence around the world with places that have the brightes

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