With stats like these, your workers probably are too fatigued.

74% of Canadians sleep less than seven hours a night.

50% of Canadians report that lack of sleep affects productivity at work.

60% of Canadians would like to take a short nap during the day if they could.

34% of Canadians feel jet-lagged after the first workday after the weekend.

36% of Canadians describe sleep as a rare luxury.

Source:

https://dairyfarmersofcanada.ca/en/dairy-in-canada/news-releases/canadians-sacrificing-sleep-yearning-better-quality-rest-national-study-shows

1 out of every 10 (9%) transportation workers is sleepy most of the time.

2 in 10 transportation workers drive when they are drowsy at least once a month.

26% of train operators say sleepiness impacts their job performance at least once a week.

23% of pilots say sleepiness impacts their job performance at least once a week.

Source:

https://www.sleepfoundation.org/professionals/sleep-americar-polls/2012-sleep-america-poll-transportation-workers-sleep