Change from an 8-hour shift to a 12-hour shift, attitudes, sleep, sleepiness and performance. Scand J. Work Environ. Health 1998; 24: 69-75. Gillberg M. Subjective alertness and sleep quality in coneection with permanent 12-hour day and night shifts. Scand. J. Work Environ. Health. 1998; 24: 76-80. 4 Sleep and Biological Rhytms 2007, cit Knauth P. The design of shift systems. Ergonomics 1993; 36: 1311-21. Pollock C, Cross R, Taylor P. Influences of 12 versus 8 hour shiftwork on injury patterns. International Ergonomics Association: Ergonomie de Lieux de Travail 1994; 5: 19-21. 5 Sleep and Biological Rhytms 2007, cit Hancock PA, Meshkati N, Robertson MM. Psychological reflections of mental workload. Aviat. Space Environ. Med. 1985; 56: 1110-14. 6 Sleep and Biological Rhytms 2007, cit Ursin H, Ursin R. Psychological indicators of mental workload. In: Moray N, ed. Mental Workload: Its Theory and measurement. Plenum Press: New York, 1979; 394-365. 7
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