Most people know not to drink and drive, but the dangers of drowsy driving are widely underappreciated. After 18 hours without sleep, driving performance is comparable to a blood alcohol concentration of 0.05%; after 24 hours awake, it's equivalent to 0.10% — above most legal drunk-driving limits.
Why drowsy driving is so dangerous:
Slowed reaction time: Sleep deprivation significantly slows the brain's response to sudden events. At 100 km/h, every extra 0.1 seconds of reaction time adds about 2.8 meters to stopping distance.
Microsleep: When severely fatigued, the brain can slip into microsleep episodes lasting 1–30 seconds — completely unbeknownst to the driver. At 100 km/h, a 10-second microsleep means approximately 278 meters of unconscious driving.
Impaired judgment and attention: Higher-order cognitive functions required for driving — maintaining lane position, judging distances, making rapid decisions — are significantly impaired by sleep deprivation.
Do you have any of these warning signs before driving? Do not drive if you experience any of the following: • Less than 6 hours of sleep the previous night • More than 16 hours of continuous wakefulness • Almost nodding off at a red light • Heavy eyelids and frequent blinking • Difficulty concentrating, mind going blank • Unable to recall the last few minutes of driving
If you feel drowsy while driving: • Pull over immediately to a safe location • Take a 20-minute nap (in a parking lot or other safe spot) • Have a caffeinated drink, then rest for 20 minutes (caffeine takes about 20 minutes to take effect) • Do not rely on open windows or loud music to fight sleepiness — these are ineffective when fatigue is severe
High-risk scenarios: • Between midnight and 6 AM (circadian rhythm trough) • Long-distance driving without a break for more than 2 hours • Driving after taking certain medications (antihistamines, some anti-anxiety drugs) • Untreated sleep apnea