http://en.wikipedia.org/wiki/Melatonin http://en.wikipedia.org/wiki/Melatonin Reduced melatonin production has been proposed as a likely factor in the signific

http://en.wikipedia.org/wiki/Melatonin http://en.wikipedia.org/wiki/Melatonin Reduced melatonin production has been proposed as a likely factor in the significantly higher cancer rates in night workers,[26] and the effect of modern lighting practice on endogenous melatonin has been proposed as a contributory factor to the larger overall incidence of some cancers in the developed world.[27] As inadequate as blood concentrations may be in brightly lit environments, some scientists now believe that a person's overnight output of melatonin can be further jeopardized each time he or she interrupts his or her sleep and turns on a bright light (suggesting that using a less-bright nightlight would be safer). Others suggest that such short exposures do no harm.[28] And yes, this comment was posted at 1:46AM.