The only reliable way to stay awake while driving is to be rested before you start. If you get drowsy on the road, pull over somewhere safe, have a cup or two of coffee and take a 20-minute nap. That's the advice from the National Highway Traffic Safety Administration (NHTSA). Opening the window, blasting the radio or slapping your cheeks may feel like they help, but they don't stop your brain from nodding off.
If you're reading this because you're tired behind the wheel right now: stop at the next safe place before you do anything else.
Free toolNap CalculatorWhen to set your alarm for a power nap or a full-cycle nap.What are the warning signs of drowsy driving?
If you notice any of these, you're already too tired to keep driving safely.
- Yawning over and over, or heavy eyelids that keep closing
- Drifting across lane lines or hitting a rumble strip
- Missing your exit or a turn
- Not remembering the last few miles
- Following too closely or missing traffic signs
- Restlessness, irritability or trouble holding your head up
NHTSA singles out crossing roadway lines and hitting rumble strips as signs to watch for, especially when you're driving alone. Drowsy-driving crashes happen most often between midnight and 6 AM and in the late afternoon, when your body clock naturally dips, and they often involve a single driver running off the road with no sign of braking.
Do tricks like opening the window or turning up the music work?
Not reliably. Cold air, loud music, chewing gum and talking to yourself can make you feel more alert for a few minutes, but they don't reduce your need for sleep. Once the novelty wears off, sleepiness comes right back, often without warning.
The real danger is microsleep. NHTSA warns that a seriously sleep-deprived driver can lose consciousness for 4 or 5 seconds at a time, even after coffee. At 55 mph, 4 seconds is about 108 yards, more than a football field, with nobody steering.
| Trick | Does it fix drowsiness? |
|---|---|
| Window down, cold air | No, brief effect at best |
| Loud music or singing | No, brief effect at best |
| Gum, snacks, slapping your face | No |
| Caffeine alone | Partly, for a short time; you may be less alert than you think |
| Pulling over for a 20-minute nap | Yes, for a short period |
| Caffeine plus a short nap | Yes, the best roadside option |
| A full night of sleep before driving | Yes, the only real fix |
How to stay awake while driving: the pull-over plan
Caffeine plus a short nap works better than either one alone. NHTSA recommends one to two cups of coffee and a 20-minute nap in a safe place, such as a lit, designated rest stop. Here's how to do it.
- Exit at the next rest area, well-lit gas station or parking lot. Not the highway shoulder.
- Drink your coffee right away. Caffeine is absorbed quickly and builds over the next half hour or so, so it starts working around the time you wake. The guide on how long caffeine takes to kick in explains the "coffee nap" research.
- Lock up, recline and set an alarm. If you lie down at 3:00 PM and allow about 5 minutes to drift off, set it for 3:25 PM. The nap calculator does this for your own timing.
- Get out and walk for 10 to 15 minutes after waking. That clears the grogginess before you drive. In this example you'd be back on the road around 3:50 PM.
- Reassess honestly. If you feel drowsy again within the hour, you need real sleep, not another coffee.
For the practical side of resting in a vehicle, like parking, fresh air and never running the engine in an enclosed space, see how to sleep in your car safely.
How much sleep do you need before a long drive?
Aim for at least 7 hours. NHTSA says getting enough sleep every day is the only true protection against drowsy driving, and urges 7 to 8 hours a night.
The risk rises sharply as sleep drops. A study of nearly 7,000 drivers in US crashes found that drivers who'd slept 4 to 5 hours in the past 24 hours had 2.9 times the odds of causing a crash compared with those who slept 7 to 9 hours, and those who slept less than 4 hours had about 15 times the odds. Long stretches awake are a problem too: see how long you can go without sleep for how 17 to 24 hours awake compares with drinking.
If you've slept badly, delay the drive, share it, or take a bus, train or ride instead. Use the sleep calculator the night before to pick a bedtime that fits your departure.
How to plan a long drive so you don't get drowsy
Build the rest into the plan instead of waiting until you're fading.
- Stop every couple of hours (a common rule of thumb) to stretch, walk and check how you feel.
- Drive with a passenger who stays awake and can take turns at the wheel.
- Avoid the risky windows of midnight to 6 AM and mid-afternoon if you can.
- Skip alcohol entirely, and check medicine labels for drowsiness warnings. NHTSA notes alcohol makes sleepiness worse.
- Time caffeine for the hard stretch, not right at departure, so it peaks when you need it.
- Book a stop if the drive is longer than you can do rested in one day.
When is drowsy driving a sign of something more?
If you get sleepy at the wheel even after a full night's sleep, talk to a doctor. Regularly nodding off while driving, loud snoring with gasping or pauses in breathing, or falling asleep in meetings and conversations can point to a sleep disorder such as sleep apnea, which is treatable. The checklist of signs you're sleep deprived is a good place to start before your appointment.
Drowsy-driving crashes killed 644 people in the US in 2024, according to NHTSA, and the agency says the true number is likely higher. Pulling over costs you 20 minutes. It's always worth it.