Possibly the most important fatigue-fighter is good quality sleep. if your drivers are feeling fatigued each morning and throughout the day, a lack of good quality sleep may be the problem. If so, a lack of sleep can contribute to chronic fatigue and exhaustion. In addition, studies have shown that poor sleep quality can contribute to chronic illnesses such as diabetes and heart disease and even shortened life expectancy. And of course, fatigue has immediate risks to your drivers, including impaired driving and other safety concerns.