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. 2009 Jan;117(1):A20–A27. doi: 10.1289/ehp.117-a20

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graphic file with name ehp-117-a20f6.jpg — The International Agency for Research on Cancer has classified shift work as a probable human carcinogen. A study in the December 2008 issue of Sleep found that use of light exposure therapy, sunglasses, and a strict sleep schedule may help night-shift workers achieve a better-balanced circadian rhythm.