A survey carried out in the United States suggests airline pilots and train operators are the most likely workers to be hit by sleepiness during a shift.
About a quarter of pilots and 23% of train operators questioned in a National Sleep Foundation poll admitted that sleepiness had affected their job performance, compared to 17% of non-transportation workers.
About 20% of members of both professions said they had made a serious error on the job because of their sleepiness.
