Many experts have found that driving while fatigued can be just as risky as driving while intoxicated. Drowsy drivers include those suffering from actual sleep deprivation and others that are simply overly tired. Either condition can contribute to slower reaction times and motor vehicle accidents.

In 2026, experts and major safety organizations like the Governors Highway Safety Association (GHSA) emphasize that drowsy driving is just as dangerous as driving under the influence of alcohol. Statistics from early 2026 reveal that while drunk driving leaves physical evidence, fatigue is a "silent threat" that kills over 6,000 Americans annually—a figure ten times higher than previously reported in federal data. Scientifically, being awake for 18 consecutive hours creates a level of impairment equivalent to a blood alcohol concentration (BAC) of 0.05%, while 24 hours of wakefulness mimics a BAC of 0.10%, which is well above the legal limit in most countries. Drowsy drivers suffer from delayed reaction times, decreased situational awareness, and "microsleeps" that can last several seconds, causing the vehicle to veer off the road at high speeds. Unlike an intoxicated driver who might attempt to brake or swerve, a driver who has fallen asleep often makes no effort to avoid a collision, leading to higher fatality rates.