Fatigue-related crashes most often occur during which time window?

• A. Between 9pm and midnight
• B. Between 2 and 6am
• C. At sunset
• D. During weekends

Answer: (B)

Fatigue crashes peak when the body is in its circadian low, which happens in the early morning hours. Between 2 and 6 a.m., most people are least alert due to the sleep-wake cycle, and long wake periods or sleep debt increase the likelihood of slower reaction times, attention lapses, and even brief microsleeps behind the wheel. That combination makes this time window the most common for fatigue-related crashes, more so than late evening, sunset, or weekends when alertness patterns vary. If you must drive during this window, plan for adequate rest and breaks, or avoid driving if possible.