The American Academy of Sleep Medicine in a position statement claimed fatigue and sleepiness are inherent safety risks in the human cloud, ride-sharing industry.

Uber and Lyft announced programs that require drivers to take a break after driving for a certain period of time. But the AASM argues these are not enough because drivers can work for more than one ride-sharing company and often work other jobs. In addition, driver often use the apps late in the night or early in the morning.

“We are dealing with a public safety issue, where low fares and salary incentives compel drivers to continue driving past their safety limits,” said Dr. Indira Gurubhagavatula, an associate professor of medicine in the Perelman School of Medicine at the University of Pennsylvania in Philadelphia and an author of the statement. “They may be unaware of the huge risks they are taking or have the false belief that sleep is overrated.”