Andrew Is an Officer on a Nuclear Submarine That on Occasion

question 68

Multiple Choice

Andrew is an officer on a nuclear submarine that on occasion stays submerged for months,preventing any exposure to natural sunlight.To help maintain his normal sleeping habits,Andrew should​ 

• A)not worry about sleep, because his internal biological clocks can function perfectly in the absence of sunlight. 
• B)not try to go to sleep unless he can barely keep his eyes open. 
• C)nap for 15-20-minute intervals once per day. 
• D)maintain a regular schedule of eating and physical activity.

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