Chicago auto accident lawyers, Zneimer Zneimer note a recently released study by the Center for Disease Control which found that 4 percent of U.S. adults admit nodding off while driving within the last month. The study found that men were more likely to report that they nodded off while driving than women. The estimates of fatal car crashes caused by drowsy drivers run from 3 percent to as high as 32 percent. The CDC urged drivers to watch for the warning signs such as having trouble keeping ones eyes open, not remembering landmarks and drifting on to the rumble strip.
The National Highway Traffic Safety Administration (NHTSA) notes that there are currently no tests available to quantify levels of drowsiness there are noted characteristics according to the NHTSA such as:
a) The crashes occur during late night/early morning or midafternoon.
Chicago Accident Lawyer Blog

