A lack of sleep can drastically affect reaction times, attention span, coordination, and judgment. These abilities are all absolutely crucial when operating a motor vehicle.  Much like drunk drivers, fatigued drivers may have trouble steering in a straight line causing the vehicle to weave between lanes. This, of course, puts you at risk of crashing into something, or worse, another vehicle. Below are several risk factors that will make you more likely to drive drowsy. Having more than one compounds the risk even further: You did not get enough sleep.
You’ve taken a sedative.
You have an untreated sleeping disorder.
You have a particularly long shift and/or work the night shift.