Practice question

According to human circadian rhythm (biorhythm) biology, during which two daily time intervals is a professional truck driver at the HIGHEST risk of acute fatigue, micro-sleep (Sekundenschlaf), and falling asleep at the wheel?

  1. Between 02:00 and 06:00 (early morning physiological low) and between 14:00 and 16:00 (post-lunch circadian dip)
  2. Between 08:00 and 10:00 in the morning
  3. Between 18:00 and 20:00 in the evening
  4. Circadian rhythms have zero effect on professional drivers

Answer: A — Between 02:00 and 06:00 (early morning physiological low) and between 14:00 and 16:00 (post-lunch circadian dip)

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