How does fatigue particularly impact driving at night?

Fatigue significantly impacts driving at night because it leads to a decrease in alertness, especially during the late night hours between 12 AM and 6 AM. This period is often when human circadian rhythms naturally cause drowsiness. As a driver becomes more fatigued, their ability to react to sudden changes in the driving environment diminishes, making it harder to respond appropriately to situations that require quick decision-making.

Furthermore, during these hours, many drivers may not only experience natural drowsiness but also face challenges like reduced visibility and increased difficulty in concentrating. This combination heightens the risk of accidents, as the levels of attention and awareness directly correlate with driving safety. Hence, the impact of fatigue becomes increasingly pronounced during these early morning hours, making this choice particularly relevant.