Falling Asleep at the Wheel

The US American Kentucky Fatality Assessment and Control Evaluation (FACE)
program has investigated semi truck fatalities since 2005, with 14 such
investigations completed. Falling asleep at the wheel was considered a primary
contributing factor for six of the fatal crashes, but falling asleep at the
wheel is often difficult to prove. However, in a recently released fatality
case report, a long-haul company driver who was awake and cognizant, stated to
a witness and EMS personnel that he fell asleep at the wheel before crashing,
and gave his name, date of birth, point of origin and destination. This
dialogue almost never happens when trying to determine the cause of a fatal
collision due to falling asleep at the wheel, the Kentucky researchers say.
This information is useful to FACE investigators to determine root causes of
semi truck transportation fatalities, examine engineering and administrative
controls such as the incorporation of driver alert systems technology in semi
trucks and the employer provision of semi truck drivers with drowsy-type driver
alert systems, and can be used to inform federal and state transportation
policy making.

More info - Source:
National Institute for Occupational Safety and Health (NIOSH)