About 15 million Americans work full time on evening shift, night shift, rotating shifts or other irregular work schedules, according to the Bureau of Labor Statistics. With these varying shifts comes an increased number of safety risks, most notably those associated with drowsy driving.

Estimates indicate more than 6,000 deaths annually can be attributed to drowsy driving while the actual instances of driving while sleep deprived are underreported, according to the National Highway Traffic Safety Administration.