Regulations that limit the number of hours worked should also provide guidance for shift start times to maximize workers' sleep opportunity and minimize the risk of on-the-job fatigue, according to a research abstract presented Tuesday, June 8, 2010, in San Antonio, Texas, at SLEEP 2010, the 24th annual meeting of the Associated Professional Sleep Societies LLC. Results indicate that estimated sleep durations varied from 4.5 hours to eight hours according to the start time of the work shift. The maximum estimated sleep duration occurred when the work shift started between 9 a.m. and 2 p... 
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