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Why Sleeping In Darkness Can Decrease Your Risk of Developing Cancer:

"...female night shift workers have a higher risk of developing breast cancer than the rest of the female population.

A fascinating study in the December 1, 2005 issue of Cancer Research provides new information that might partly explain why this is.

Researchers found that sleeping for several hours in nighttime darkness promotes a healthy blood level of a hormone called melatonin, which can significantly suppress the growth and proliferation of breast tumours.

They also found that sleeping while exposed to light at night causes a dramatic drop in blood melatonin levels, setting the stage for growth and proliferation of breast cancer cells.

This study provides evidence that may partly explain why breast cancer is five times more common in industrialized nations compared to less developed countries. It may also explain why visually challenged people have lower rates of cancer than people who have no problems with vision."