Many people have driven while being incredibly sleepy, but how tired is too tired? And what can you do if you have to soldier on? CNN’s Randi Kaye finds out that there’s a level of exhaustion that can put you at serious risk while on the road.

Experts warn that driving while severely fatigued can impair alertness to a degree comparable to being over the legal alcohol limit. Dr. Fawzia Dabaja explains that tired drivers often experience 'microsleep' episodes, sometimes lasting only a few seconds, which can occur without the driver realizing. Signs of excessive tiredness include frequent yawning, difficulty keeping eyes open, missing turns or exits, and general exhaustion.

Statistics from the National Highway Traffic Safety Administration indicate that drowsy driving was linked to an estimated 91,000 crashes and nearly 800 deaths in the United States in 2017. Dr. Dabaja recommends that drivers who feel drowsy should pull over for a short nap or consume caffeine, as opening windows or playing loud music are not effective in maintaining alertness. Less than seven hours of sleep increases the risk of a crash, and drowsy drivers are more likely to make risky decisions on the road.

Tired drivers often ‘microsleep'

If you've ever driven while tired, really tired, it turns out it's almost as bad as driving drunk. You see that individuals that have been awake for more than 20 to 21 hours have the same level of alertness and attentiveness as someone who has been intoxicated above the legal limit of alcohol. Dr. Fawzia Dabaja says tired drivers often micro-sleep, even while they're driving. It can be just for a few seconds, but you are essentially sleeping. You may not even realize it. How do you know if you're too tired to drive? Symptoms can be very subtle. Some people can be yawning. They can feel like they can't keep their eyes open. They may just feel generalized kind of fatigue or exhaustion. You can also see that people tend to miss their turns or exits. Want to stay awake behind the wheel? We got you covered in a moment. Basically less than seven hours of sleep is an increased risk for a crash. Definitely less than seven hours we know puts at you increased risk. In the U.S., there were an estimated 91,000 crashes and nearly 800 deaths due to drowsy drivers in 2017. That's according to the National Highway Traffic Safety Administration. Dr. Dabaja says when drowsy people get behind the wheel, they tend to take more risks. They pull out in front of oncoming traffic more often and drive too closely to the car in front of them. Your judgment is off, right? Definitely. Your judgment's off. So what if you're ready to nod off, but you still have to get yourself from point A to point B? I'd recommend pulling to the side of the road, taking at least a 20-minute nap, possibly at a rest stop, because that can help rejuvenate you. Dr. Dabaja also recommends this tried and true standby, caffeine. Either brew some at home and take it with you on the go, or if you get drowsy along the way, you can pick up some while you're on the move. And this might surprise you. She says don't bother opening a window, and definitely don't count on Taylor Swift or Beyonce to stay awake. If I crank up the music, it won't help me stay alert. Studies have shown that that's not sufficient to keep people awake on the road. It may help for a few minutes, but it's not sufficient enough to keep you from possibly getting into a car crash.

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