As Sailors, sleep can seem like a luxury or low priority relative to mission demands, and surviving off of little to no sleep is often worn like a badge of honor. However, the amount of sleep the body needs doesn’t vary by individual—seven to eight hours of uninterrupted sleep per night is ideal for all Sailors, according to Naval Postgraduate School’s Crew Endurance website.
The 2011 DoD Health Behaviors Survey of Active Duty Personnel found that less than 50 percent of active duty service members get at least seven hours of sleep per night, increasing risk for a myriad of psychological health issues such as depression, anxiety and suicide risk.
A good night’s sleep is so vital that even slight deprivation can negatively affect performance, memory, mood and judgment, as well as one’s perception of and response to stress. When you’re sleepy, you may feel irritable, lack motivation, or lose patience more quickly, impacting everything from decision-making and impulsivity, to family relationships and operational readiness.
Crew Endurance, developed by Naval Postgraduate School with collaboration from Navy’s Operational Stress Control Program, offers practical tips, research and operational tools for promoting adequate rest. To build your endurance:
- Aim for seven to eight hours of uninterrupted sleep per night, preferably at the same time each day. While uninterrupted sleep is ideal, compensating for any sleep deficit with a nap has proven benefits. A twenty-minute nap can help mitigate the effects of extended periods without rest on the mind and body, giving you a power boost. Avoid trying to plow through your day without adequate rest. Going 22 hours without sleep has the same effect on performance as being legally drunk!
- Avoid large meals and vigorous exercise close to bedtime. Consuming a nutritious and balanced diet is essential for fueling the mind and body, however, eating large meals before bedtime can lead to sleep disturbances. Aim to make your last meal of the day your smallest, and avoid alcohol in the last few hours before bedtime. Similarly, while exercising regularly can lead to stable energy throughout the day, avoid exercising within two to three hours before going to bed. For fitness and nutrition tips, check out Navy Physical Readiness.
- Use caffeine strategically. Coffee and other caffeinated beverages are best suited for the first part of your shift to promote alertness. However, caffeine, including soft drinks, should be avoided before bedtime. Instead, hydrate with nature’s best: water.
Other tips for promoting optimal rest include blocking light and limiting noise in your sleep environment by using eye masks and ear plugs. It’s also preferable to use bright light in the workspace to aid the body’s natural circadian rhythm.
There are several ways to promote healthy sleep and work patterns at the command level as well, such as the Circadian-Based Watch Schedule, which has been tried by more than a dozen ships around the fleet. A circadian-based watchbill is any schedule which is built around a 24-hour day, with stable sleep periods each day vice those built upon 15, 18 or 20 hour days. In combination with adjusting meal hours, allowing adequate time for physical training and holding most meetings mid-day, Circadian-Based Watch Schedules can promote crew alertness, optimize readiness and enhance command climate.
To learn more about sleep, test your fatigue level or find out how your command can implement a Circadian-based Watch Schedule, visit Crew Endurance at my.nps.edu/web/crewendurance/index.