The risk factors for drowsy driving are many. Unfortunately, many of these risk factors occur frequently with commercial truck drivers. Risk factors include: Shift workers Professional drivers Young drivers Driving between midnight and 6:00 a.m. when the body tends to be sleepier Driving alone Driving on a monotonous road Driving for long hours Having less than six hours of sleep Chronic lack of enough sleep Sleep apnea Other sleep disorders Poor quality sleep Stress Drivers who have medications or alcohol in their system Other factors can lead to fatigued driving that you might not imagine, so you want an attorney to investigate the possibility of a drowsy driver causing your crash and injuries.