A US study suggests that black and Hispanic drivers are at twice the risk of falling asleep at the wheel compared to whites, and differences in sleep quality explain at least some of the disparity between blacks and whites, reports the New York Post.

“We want readers to understand the public health importance of drowsy driving,” said senior study author Dr. Sanjay Patel, director of the Center for Sleep and Cardiovascular Outcomes Research at the University of Pittsburgh, “and how – like many other health measures – blacks and Hispanics face a greater burden in the United States.”