Sleep Apnea & Truck Driver Fatigue

Sleep Apnea & Truck Driver Fatigue in Indiana

Driving while fatigued or drowsy is an ever-present risk for a commercial driver. Long days on the road, combined with less-than-ideal sleeping conditions and deadline pressures, mean that accidents caused by driver fatigue are a danger to all on the road. Anyone who has ever taken a multi-day road trip knows how you can become progressively more tired each day.

Many reasons for driver fatigue are caused by behaviors at least partially under a driver’s control, such as not attempting to obtain sufficient sleep, not taking rest breaks, or choosing to violate the hours-of-service requirements. But one big reason for driver fatigue is medical, and it is not under a driver’s control. It’s called obstructive sleep apnea (OSA) and, while it is treatable, it often goes undiscovered or untreated.

Two Deadly Crashes

Modern large trucks can weigh as much as 80,000 pounds, and, in certain cases, even more. An out-of-control big rig with a sleeping driver is deadly. The six-vehicle crash on the New Jersey Turnpike in 2014 that killed comedian James McNair and critically injured comedian-actor Tracy Morgan along with two others was caused by a truck driver who had not slept in over 28 hours. It’s estimated he was traveling 65 mph in a 45 mph zone.

In an Ohio crash involving a driver with sleep apnea, a man who was pulling three trailers hit six vehicles, killing one person nearly instantly and critically injuring two others. Records proved that the driver had a history of sleep apnea and had been involved in previous accidents.

Facts about Truck Driver Fatigue

Driver fatigue contributes to approximately 13 percent of tractor-trailer crashes, or more than 1 in 8, according to the Federal Motor Carrier Safety Administration’s (FMCSA) Large Truck Crash Causation Study. During 2015, the numbers indicate that:

• 3,598 fatal large-truck crashes occurred.
• Roughly 83,000 injury-producing large-truck crashes occurred.
• Some form of driver error, of which fatigue is one, was a contributing factor in one-third of large-truck crashes.

Obstructive sleep apnea, which keeps you chronically sleep-deprived, is considered a special risk among large-truck drivers. FMCSA estimates that 28 percent of all commercial drivers have some form of OSA, with around 9 percent, or one driver in 11, having a moderate-to-severe case. An untreated driver suffering from OSA with moderate-to-severe sleep apnea is disqualified from driving.

Those with OSA are also prone to a phenomenon called microsleeps, which exacerbates the problem. In simulator studies, sleep-deprived drivers had as many as 140 microsleeps an hour, with each episode lasting an average of eight seconds. The number of simulator “crashes” rose with the number of microsleeps recorded.

OSA and Microsleeps

Obstructive sleep apnea is a breathing disorder in which neck muscles relax, causing a partial or complete blockage of airflow, stopping the breathing process. When airflow is cut off, the sleeper abruptly awakens but usually falls back to sleep. They may not even recall waking up. Those with severe OSA can have hundreds of episodes a night, creating constant fatigue and daytime microsleeps.

A microsleep is simply an extremely short episode of sleep that happens involuntarily because the body is extremely fatigued. During the microsleep time period, which can last as long as 30 seconds, the person is truly asleep and not in control of anything. If microsleeps occur while a driver is behind the wheel, the potential for fatal accidents is significant. Microsleeps and OSA are firmly linked.