Sleep apnea is not addressed explicitly in FMCSA regulations. However, these regulations state that anyone with a medical history or clinical diagnosis of any disorder that can interfere with their driving abilities shouldn't be medically qualified to drive commercially in interstate commerce. Additionally, motor carriers can't require or allow truck drivers to drive a commercial vehicle if they have any condition that impacts the safe operation of a vehicle. Untreated sleep apnea is one of these conditions. Sleep apnea is treatable; treatment can improve sleep quality and prevent extreme drowsiness during waking hours. Once the truck driver addresses this problem and receives appropriate treatment, they are again allowed to drive.