“Shift work refers to work that takes place outside of traditional 9-to-5 daytime hours. If you work nights or rotating shifts, you are a shift worker. Many people who work shifts are at risk for developing shift work disorder (SWD) and may experience excessive sleepiness (ES) on the job.” So says the website designed to market the drug known as Nuvigil, sold by Cephalon, a subsidiary of Teva Pharmaceutical Industries, Ltd. Approved by the US Food and Drug Administration (FDA) in 2007 to treat narcolepsy and obstructive sleep apnea and the excessive sleepiness that may come with working a…