Most drowsy-driving accidents occur between the hours of _____.

The correct answer focuses on the time frame when human alertness tends to be at its lowest, which is typically between midnight and 6 a.m. During these early morning hours, many people are inclined to be asleep, leading to a heightened risk of drowsy driving for those who are behind the wheel. This period aligns with the body's natural circadian rhythms, where sleepiness peaks, and cognitive functions may be impaired. Drivers who are active during these hours may be more prone to fatigue, resulting in decreased attention and slower reaction times.

Additionally, knowing that the majority of drowsy-driving incidents occur during this late-night to early-morning window allows drivers to make informed decisions about travel plans, encouraging them to avoid driving during these risks or to ensure they are well-rested. The other time frames mentioned generally align with higher levels of activity and alertness, making them less associated with drowsy-driving incidents.