“People think they can judge the precise time they are too tired and don’t realize that ‘drowsy driving’ is a serious danger,” says David Cloud, CEO of the National Sleep Foundation. “They don’t know that it’s possible to fall into a 3-4 second microsleep without realizing it. Traveling at 65 MPH, that’s enough time to travel the length of a football field basically unconscious.”

Even if you manage to stay awake, sleepiness causes slower reaction times, vision impairment, lapses in judgment and delays in processing information, which are all critical elements for safe driving practices. “Getting enough sleep can literally save your life,” adds Cloud.

Prevent a fall-asleep crash by getting enough sleep the night before and by knowing the warning signs of sleepiness and using appropriate countermeasures.

Warning Signs: Feeling Sleepy? Stop Driving!

If you start to do the following, it’s time to get off the road. Find a safe place to pull over:

• Have problems focusing, blink frequently and/or have heavy eyelids;
• Drift from your lane, swerve, tailgate and/or hit rumble strips;
• Have trouble remembering the last few miles driven;
• Miss exits or traffic signs;
• Have trouble keeping your head up;
• Yawn repeatedly;
• Or finding yourself rolling down the windows or turning up the radio.

National Sleep Foundation’s Countermeasures to Prevent Fall-Asleep Crashes

• Get a good night’s sleep before you hit the road. You’ll want to be alert for the drive, so be sure to get adequate sleep (seven to nine hours) the night before you go.
• Don’t be too rushed to arrive at your destination. Many drivers try to maximize the holiday weekend by driving at night or without stopping for breaks. It’s better to allow the time to drive alert and arrive alive.
• Use the buddy system. Just as you should not swim alone, avoid driving alone for long distances. A buddy who remains awake for the journey can take a turn behind the wheel and help identify the warning signs of fatigue.
• Take a break every 100 miles or 2 hours. Do something to refresh yourself like getting a snack, switching drivers, or going for a run.
• Take a nap—find a safe place to take a 15 to 20-minute nap, if you think you might fall asleep. Be cautious about excessive drowsiness after waking up.
• Avoid alcohol and medications that cause drowsiness as a side-effect.
• Avoid driving at times when you would normally be asleep.
  Consume caffeine. The equivalent of two cups of coffee can increase alertness for several hours.

For more information about sleep and safety, visit the National Sleep Foundation’s Web site at sleepfoundation.org.

• Pilots should be screened for sleep disorders during medical certification.
• More research should be conducted on fatigue in short-haul flight operations.
• Any information from research on fatigue should be made available to flight crews working short-haul flights.
• Guidance from research should be included in operators’ operating specifications.
• The FAA should implement a program to identify pilots at high risk for sleep apnea.
• Guidance should be made available for pilots, employers and physicians regarding the identification and treatment of individuals at high risk of sleep apnea.

Read NTSB’s recommendations, or learn more about sleep apnea.