Drunk driving and "buzzed driving" are big-time problems on American roadways. Along with driving under the influence, drowsy driving is now considered a major factor in U.S. traffic accidents and deaths.

The U.S. Centers for Disease Control and Prevention notes 2.5 percent of fatal crashes and 2 percent of non-fatal crashes involve drowsy driving. However, studies have estimated as many as 33 percent of fatal crashes may be caused by drowsy drivers nodding off at the wheel.

The CDC also reported a shocking 1 in 25 people say they have actually fallen asleep while driving in the past month alone.

Drowsy driving is considered driving impaired, because it slows reaction times and affects your decision-making skills—both of which can have deadly consequences.

Drivers getting six or fewer hours of sleep a night were twice as likely to report falling asleep at the wheel than those getting seven or more hours, according to the CDC.

If you’re showing signs of drowsy driving—like struggling to keep your eyes open—the safest thing to do is either switch with another driver who isn’t sleepy or get off the road and rest until you’re not tired anymore.