Final answer:
Crew rest must provide an opportunity for sleep and recovery to ensure safety and optimal performance.
Step-by-step explanation:
Crew rest must provide an opportunity for sleep and recovery. During crew rest, individuals must have enough time to rest and recharge their energy levels, allowing them to recover from fatigue and perform their duties effectively.
This is particularly important in high-stress and demanding professions like aviation and maritime, where crew members need sufficient rest to ensure safety and optimal performance.