Many drivers don’t want to admit that they’re stressed because they see that admission as a sign of weakness. But commercial driving is a stressful occupation. And there’s no question that stress causes physical effects on the body, including chronic pain and fatigue. Stress day-in and day out means that a commercial driver’s body is in often in a fight-or-flight mode, which releases stress chemicals like cortisol and adrenaline. And if the stress is continuous, it can lead to burnout and a lack of motivation, which often results in feeling tired even after short periods of driving.