http://articles.mercola.com/sites/articles/archive/2001/09/29/shift-work-part-two.aspxA growing body of evidence suggests the modern world's move away from 9-to-5 jobs is taking a toll on workers' health -- and society's pocketbook. Shift work appears to throw off the body's natural rhythm enough to lead to chronic sleep disturbances,enCommunityServer 2008.5 SP1 (Build: 31106.3070)