What must be included in the rest period according to Sp and P?

The correct answer emphasizes the requirement for a rest period that includes a minimum of 6-8 hours of actual sleep. This guidance is rooted in the need for pilots to be well-rested and alert to ensure safety and performance in their duties. Adequate sleep is crucial for cognitive function, decision-making, and overall physical health—all vital attributes for effective piloting.

Regulations regarding rest periods are designed to mitigate fatigue and ensure that pilots have sufficient recovery time to maintain high levels of performance. Specifically calling for actual sleep hours ensures that the rest period is meaningful and transformative, contributing to the pilot's alertness and readiness.

While other options may address aspects of rest or total downtime, they do not specifically target the necessity for actual sleep, which is essential for cognitive restoration. Proper sleep hygiene is foundational for performance in aviation, and thus the emphasis on a specific range of hours dedicated to actual sleep is critical. This underscores the priority on physiological well-being within aviation regulations.