The construction industry had the next highest percentage of workers who reported sleeping on the job—68 percent, even though 66 percent of them admitted that sleeping while at work is prohibited, reports SHRM.

“While most people associate tiredness and fatigue with exercising the body, it can also be caused by exercising the mind,” explained Steve Wang, an HR consultant based in Chicago. “Certain jobs that require heavy critical thinking and technical expertise exhaust the human brain. As a result, employees [who are] constantly put in these types of scenarios are more prone to falling asleep at work.”