Drowsy Driving Fatalities: The Overlooked Cause of Many Deadly Crashes

Most people understand the dangers of drunk driving and distracted driving. Public safety campaigns, law enforcement initiatives, and media coverage have long highlighted the risks associated with alcohol impairment and cellphone use behind the wheel. Yet one of the most dangerous threats on California roads often receives far less attention: drowsy driving.

Fatigue can significantly impair a driver’s ability to react, concentrate, make decisions, and recognize hazards. In some cases, an exhausted driver may actually fall asleep at the wheel for several seconds before a collision occurs. At highway speeds, those few seconds can be enough to cause a catastrophic or fatal crash.

Drowsy driving accidents are often underreported because there is no simple test to measure fatigue after a collision. Nevertheless, safety experts have long recognized that driver fatigue contributes to thousands of serious accidents every year. When a fatigued driver causes a fatal collision, surviving family members may have the right to pursue a wrongful death claim under California law.

At Kalfayan Merjanian, LLP, our personal injury trial attorneys help families seek justice after preventable fatal accidents. Understanding how fatigue contributes to deadly crashes can help explain why drowsy driving is often just as dangerous as other forms of impaired driving.

Why Is Drowsy Driving So Dangerous?

Driving safely requires constant attention and quick decision-making. A driver must monitor traffic, adjust to changing road conditions, maintain lane position, respond to hazards, and make countless judgments every minute. Fatigue affects nearly every one of these abilities. Research has shown that sleep deprivation can impair reaction times, judgment, attention span, and coordination. In some situations, the effects of severe fatigue can resemble alcohol impairment. A drowsy driver may struggle to maintain speed, drift between lanes, miss traffic signals, fail to notice pedestrians, or react too slowly to avoid a collision. In the most extreme cases, the driver may experience a “microsleep”—a brief period of sleep that can occur without warning while the vehicle remains in motion.

What Is a Microsleep?

A microsleep is a short, involuntary episode of sleep that can last for a few seconds. While that may not sound significant, the consequences can be devastating. A vehicle traveling 65 miles per hour covers approximately 95 feet every second. A driver who falls asleep for just four or five seconds may travel hundreds of feet without actively controlling the vehicle. Many fatal fatigue-related crashes occur because the driver never brakes or takes evasive action before impact. Investigators often find little or no evidence that the driver attempted to avoid the collision.

Who Is Most at Risk for Drowsy Driving?

Although anyone can become fatigued behind the wheel, certain groups face a higher risk of drowsy driving accidents in California. Commercial drivers spend long hours on the road and work demanding schedules. Shift workers frequently experience disrupted sleep patterns, particularly those who work overnight or rotating shifts. Individuals with untreated sleep disorders may also suffer from excessive daytime fatigue that affects their ability to drive safely. Common high-risk groups include:

• Commercial truck drivers and delivery drivers
• Healthcare workers
• First responders
• Construction workers
• Shift workers and overnight employees
• Individuals with sleep apnea
• People working multiple jobs
• Drivers traveling long distances

Even otherwise healthy individuals can become dangerously fatigued if they do not get enough sleep.

How Do Sleep Disorders Contribute to Fatal Crashes?

Many people suffer from sleep disorders without fully appreciating how much these conditions affect their daily functioning. Sleep apnea, insomnia, narcolepsy, and other sleep-related disorders can significantly reduce sleep quality and lead to excessive daytime drowsiness. A person may believe they are getting adequate rest while still experiencing substantial fatigue. Sleep apnea is particularly common. Individuals with untreated sleep apnea often experience repeated interruptions in breathing throughout the night, preventing restorative sleep. When these conditions go untreated, the risk of fatigue-related accidents can increase dramatically.

Why Are Commercial Drivers Frequently Involved in Fatigue-Related Accidents?

Commercial drivers operate large, heavy vehicles for extended periods of time. Despite federal and state regulations limiting hours of service and requiring rest periods, fatigue remains a serious concern within the transportation industry. Truck drivers, delivery drivers, bus operators, and other commercial vehicle operators may face demanding schedules, long shifts, tight deadlines, and extended periods behind the wheel. While many commercial drivers follow safety regulations carefully, violations of hours-of-service requirements still occur. In some cases, driver logs, electronic records, dispatch communications, and scheduling records reveal that a driver was operating a vehicle while fatigued. Because commercial vehicles are larger and heavier than passenger cars, fatigue-related crashes involving trucks and buses often result in severe or fatal injuries.

What Types of Fatal Accidents Are Commonly Associated With Driver Fatigue?

Drowsy driving can contribute to virtually any type of collision, but certain crash patterns appear frequently in fatigue-related cases. A fatigued driver may drift out of their lane and strike oncoming traffic head-on. They may fail to notice stopped vehicles ahead, causing high-speed rear-end collisions. Some drivers leave the roadway entirely and strike fixed objects, barriers, bicyclists, or pedestrians. Fatigue-related crashes are especially common during overnight hours, early morning hours, and late afternoon periods when natural dips in alertness occur. Highway and freeway collisions are particularly common because long, monotonous stretches of driving can contribute to driver fatigue.

How Is Driver Fatigue Proven After a Fatal Accident?

Unlike alcohol impairment, fatigue cannot be measured with a breath test or blood test after a crash. As a result, proving drowsy driving often requires a careful investigation of the surrounding circumstances.

Evidence may include:

• Driver work schedules
• Hours-of-service records
• Electronic logging device data
• Cell phone records
• Surveillance footage
• Eyewitness testimony
• Vehicle event data recorder information
• Dispatch records
• Employment records
• Medical records involving sleep disorders

Investigators may also look for evidence that the driver failed to brake, steer, or otherwise react before impact. The absence of evasive action can sometimes support an inference that the driver was asleep or severely fatigued. Determining whether fatigue played a role often requires examining the driver’s activities in the hours and days leading up to the collision. Investigators may seek answers to questions such as:

• How much sleep did the driver receive before the crash?
• How many hours had the driver been awake?
• Was the driver working long shifts?
• Did the driver have a diagnosed sleep disorder?
• Were there prior reports of fatigue?
• Did the driver violate safety regulations?
• Did electronic records reveal prolonged driving periods?

The answers can help establish whether fatigue contributed to the fatal collision.

Can Fatigued Driving Constitute Negligence?

Yes. Drivers have a responsibility to operate their vehicles safely. A person who knowingly drives while dangerously fatigued may be found negligent if their condition contributes to a collision. Just as a driver should not operate a vehicle while intoxicated, a driver who is too tired to drive safely may place others at significant risk. In wrongful death litigation, the central question is often whether the driver’s conduct fell below the standard of reasonable care under the circumstances.

Who Can Bring a Wrongful Death Claim After a Fatal Fatigue-Related Crash?

California’s wrongful death statutes allow certain family members to seek compensation when a loved one’s death is caused by another person’s negligence. Eligible claimants include surviving spouses, domestic partners, children, and certain other heirs if those family members are unavailable, according to California CCP 377.60.

What Compensation May Be Available?

A wrongful death claim seeks to compensate surviving family members for the losses resulting from the death. Under CCP 377.61, family members can recover damages that “under all the circumstances of the case, may be just,” with certain exceptions. Typically, recoverable damages include the loss of financial support, funeral and burial expenses, and the loss of companionship, comfort, care, assistance, protection, affection, guidance, and moral support. When the deceased was a parent, spouse, or primary wage earner, the financial consequences can be substantial in addition to the emotional loss experienced by surviving family members.

Why Is Early Investigation Important?

Evidence of driver fatigue can disappear quickly. Electronic records may be overwritten, employment records may become more difficult to obtain, and witness memories may fade. In commercial vehicle cases, preserving driver logs, dispatch records, and vehicle data can be particularly important. Prompt investigation often allows attorneys to secure critical evidence before it is lost.

How Kalfayan Merjanian, LLP Helps Families After Fatal Drowsy Driving Accidents in California

At Kalfayan Merjanian, LLP, we understand that fatigue-related crashes are preventable tragedies. Our firm works with accident reconstruction experts, investigates driver conduct, analyzes electronic records, and pursues justice and accountability when negligence causes the loss of a loved one. Drowsy driving cases frequently require a detailed examination of work schedules, sleep patterns, vehicle data, and other evidence that may not be obvious during the initial investigation. We are committed to uncovering the facts and helping families pursue the compensation available under California law.

If you have lost a loved one in a fatal accident involving a fatigued driver in California, contact Kalfayan Merjanian, LLP to discuss your legal rights and learn how we may be able to help.