Which strategy helps mitigate hazard risk due to circadian misalignment in night operations?

• A. Increased nighttime caffeine to all crew
• B. Skipping planned rest periods to complete tasks
• C. Planning workload and rest to minimize risk through proper sleep
• D. Overnight overtime with no sleep

Answer: (C)

Managing hazard risk from circadian misalignment in night operations comes down to scheduling that respects the body's natural sleep-wake cycle. By planning workload and rest so crew can obtain adequate sleep, you reduce sleep debt and maintain vigilance, reaction time, and decision-making during night hours when performance naturally declines. This approach sets up safe performance for high-risk tasks by ensuring meaningful rest opportunities and avoiding long periods of wakefulness that amplify fatigue.

Relying on caffeine for everyone only provides a temporary lift and doesn’t fix the underlying sleep loss; it can also disrupt sleep quality later and introduce its own variability in performance. Skipping planned rest periods or pushing through with no sleep greatly increases fatigue and cognitive errors. Overnight overtime with no sleep is especially dangerous, causing severe sleep deprivation and a sharp drop in safety margins.