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I have read this article from Health and Home, The National Journal of Better Living (March-April 2002 Edition) says that women exposed to light during the night have higher risk of cancer. According to Scott Davis of Hutchinson Cancer Research 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.
Furthermore, according to Johanni 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 further noted 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.
Furthermore, according to Johanni 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 further noted 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.
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