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MAP20071022617Graham, SandyAre your employees dead tired? : sleepy workers may need medical attention / by Sandy GrahamSumario: Many of the 22 million shift workers in the United States, particulary those who work rotating shifts of days, then afternoons and then nights, suffer from sleep disorders. The National Commission on Sleep Disorders Research reports that insomnia, the inability to sleep or sleep well, affects an estimated 40 percent to 80 percent of shift workersEn: Safety & health. - Itasca. - Vol. 151, nº 3, March 1995 ; p. 62-661. Ergonomía. 2. Insomnio. 3. Fatiga mental. 4. Ritmo circadiano. 5. Trabajo por turnos. I. Título. II. Título: Safety & health.