The latest research indicates that working night shifts may increase the incidence of breast and prostate cancer. Because the hormone melatonin is produced at night when we are asleep, night shift workers suffer a loss of melatonin due to working in artifical light. Since melatonin has been found to suppress tumor development, then it follows that depletion of this hormone may increase the likelihood of tumor formation.
For those who work at night it is recommended that when they return home to sleep their room be darkened to resemble night, this will allow for melatonin production to take place. Shift workers who rotate their shifts, switching between night and day work, may suffer severe sleep disorders as a result, for their biological clock fails to adapt to the constant change in sleep times.
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