Researchers believe more than 40 percent of the nation's 14 million truck drivers are obese, which puts them in danger of sleep apnea.
In fact, estimates are almost one in three drivers has the disease, which keeps them from getting proper rest. Apnea makes them vulnerable to falling asleep at the wheel and causing a deadly accident.
So now a growing number of trucking firms are screening drivers for apnea and treating them for the condition. A government agency is now considering new rules to compel screening of heavier drivers.