How Many People Die in Drowsy Driving Crashes Each Year?

Quick answer: In 2024, 644 people died in US crashes involving a drowsy driver, according to NHTSA's Traffic Safety Facts Overview 2024 — 1.6% of all road deaths that year, and a 1.1% rise from 637 in 2023. While deaths fell in almost every other crash category in 2024, drowsy-driving deaths went up. And NHTSA itself says the real toll is higher, because tired drivers leave few clues behind.

Drowsy deaths rose while most deaths fell

The headline figure comes from NHTSA's national census of fatal crashes, FARS: 644 fatalities involving drowsy drivers in 2024, up from 637 in 2023. That is a small increase in absolute terms, but it stands out against the national picture:

• Total US road deaths fell 4.3% in 2024, from 41,025 in 2023 to 39,254 — the third year-on-year fall in a row.
• Speeding-related deaths fell 5.2%, alcohol-impaired deaths fell 3.9%, and distraction-affected deaths fell 2.3% to 3,208.
• Drowsy driving was one of the few categories to move the wrong way, alongside deaths involving older drivers.

At 1.6% of all traffic fatalities, drowsiness looks like a small share. The next sections explain why the official share understates the problem.

The official count is an undercount

NHTSA is unusually frank about the limits of its own number. Its drowsy-driving page states that "determining a precise number of drowsy-driving crashes, injuries, and fatalities is not yet possible", because crash investigators can only look for clues that sleepiness played a part, and those clues are not always identifiable or conclusive. There is, in NHTSA's words, broad agreement across the traffic-safety, sleep-science and public-health communities that the official figure is an underestimate.

The Governors Highway Safety Association (GHSA) made the same point in its 2026 Wake Up Call report: FARS data indicated that 1.5% of fatal crashes in 2023 involved a drowsy driver, but police reports substantially underestimate drowsy driving because officers have no direct observation of drivers before a crash, and states and localities report suspected drowsiness differently. A driver who fell asleep cannot always tell anyone what happened — and a surviving driver has little reason to volunteer that they dozed off.

Who is most at risk

Falling asleep at the wheel is far more common than the death count suggests. A CDC survey of adult drivers found that about 1 in 25 drivers aged 18 or older — 4.2% — reported having fallen asleep while driving in the previous 30 days. The same survey found the highest prevalence among drivers aged 25 to 34, higher rates among men than women, and the lowest rates among drivers aged 65 and older.

NHTSA also flags teenagers as vulnerable: many teens do not get enough sleep at a stage of life when their biological need for sleep is greatest, which puts them at risk on longer trips. Its advice to parents is blunt — tell teens to delay driving until they are well rested. For the wider picture of young-driver risk, see the state-by-state data on US car accident deaths.

When and where drowsy crashes happen

NHTSA identifies three patterns that mark out a typical drowsy-driving crash:

• They occur most often between midnight and 6am, or in the late afternoon — the two daily dips in the body's circadian rhythm.
• They often involve a single driver, with no passengers, running off the road at high speed with no evidence of braking.
• They frequently happen on rural roads and highways — long, monotonous stretches where an alert driver would normally react.

That pattern is one reason autumn is the danger season for tired driving. US clocks go back on Sunday 1 November 2026, shifting the evening commute into darkness and disrupting sleep for millions of people. Halloween, on Saturday 31 October, adds a late night of driving to the same weekend — and Halloween evening is already measurably deadlier for pedestrians.

How to stay alert, according to NHTSA

NHTSA's drowsy-driving guidance is built around one principle: the only real protection is sleep. Its tips include:

• Get seven to eight hours of sleep a night — adequate sleep is the only true way to protect yourself against drowsy driving.
• Avoid alcohol before driving, because alcohol interacts with sleepiness to increase drowsiness and impairment.
• Check medication labels — prescription and over-the-counter medicines can cause drowsiness.
• Avoid driving during peak sleepiness periods — midnight to 6am and the late afternoon — and watch for signs of drowsiness such as crossing lane lines or hitting a rumble strip.

Coffee alone is not a fix. NHTSA warns that caffeine's effects last only a short time, and a seriously sleep-deprived driver can still suffer "micro sleeps" — brief losses of consciousness lasting four or five seconds, during which a car at 55 miles per hour travels more than 100 yards. If you start to feel sleepy, NHTSA advises drinking one to two cups of coffee and pulling over for a short 20-minute nap in a safe place, such as a lighted, designated rest stop. The National Sleep Foundation marks Drowsy Driving Prevention Week each early November — a reminder that arrives with the darker evenings.

How these numbers were counted

All US figures are from NHTSA's Traffic Safety Facts Research Note: Overview of Motor Vehicle Traffic Crashes in 2024 (Report No. DOT HS 813 791, April 2026), which draws on the Fatality Analysis Reporting System — the census of every fatal motor-vehicle crash on US public roads in which someone died within 30 days. "Fatalities involving drowsy drivers" are crashes in which a driver was recorded as drowsy, asleep, fatigued, ill or blacked out in the police report. The 2024 figures come from the Annual Report File, which NHTSA can revise when it issues the final file; 2023 figures are final. The CDC falling-asleep figures are self-reported survey data from 19 states. See today's live accident reports and the full article archive for more.