Women exposed to light during the night have higher risk of cancer. Studies by Scott Davis of the Hutchinson Cancer Research and colleagues, and Eva S. Schernhammer of Harvard Medical School also found out that light exposure may be caused by working the night shift, having insomnia, or being exposed to light in the bedroom during sleep.
According to Johnni Hansen of the Danish Cancer Society, one possible explanation for the relationship of light exposure and cancer has to do with melatonin production. Melatonin is produced by the brain's pineal gland. Because it is released into the bloodstream at night, the hormone is thought to play a role in regulating sleep.
Hansen notes that when normal melatonin cycles are interrupted in women, the production of estrogen from the ovaries is higher and this may contribute to their breast cancer risk.
Thanks to : Health & Home March-April 2002 (NEWSLINES)
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