In addition, recent research shows that sleep deprivation takes a toll on decision-making ability. “If you’re sleep deprived, that’s hard to do.” Gandis Mazeika, head of Sleep Medicine Northwest in Seattle. “When you’re trying to understand the subtext of what someone is saying, your brain needs to use a bunch of programs at the same time,” says Dr. Multitasking - an inescapable bane of managerial work - becomes exponentially more so.Ī deficit of REM sleep also makes it tougher to pick up on nuances in discussions or negotiations. When your brain is starved of REM sleep, concentrating on a single activity is challenging. When you sleep through only one or two cycles instead of three or four, your REM sleep is disproportionately affected. Later sleep cycles tend to have longer REM periods than cycles earlier in the night.Your brain, when confronted with sleep deprivation, opts for lighter sleep and hence less REM sleep.And when you cut back on sleep, your REM sleep suffers the most. Performing complex tasks and navigating complicated relationships - the heart and soul of a manager’s work - both become much harder to do when REM sleep suffers. The same 2008 sleep poll found that people who sleep less than 6 hours per night during the workweek are twice as likely as their better-rested colleagues to report difficulty in concentrating.Ī deficit in sleep leads to deficits in work performance A lack of REM sleep results in slower cognitive and social processing, problems with memory, and difficulty concentrating. In REM sleep - stage 4 in the sleep cycle - the brain processes and synthesizes memories and emotions, activity that is crucial for learning and higher-level thought. According to the National Sleep Foundation’s 2008 Sleep in America poll, those who sleep less than 6 hours per night on workdays are significantly more likely to be obese than those who sleep 8 hours or more (41% vs. Without deep sleep, you’re more likely to get sick, feel depressed, and gain an unhealthy amount of weight. In a full night’s sleep, we experience three or four such cycles, each lasting 60 to 90 minutes.ĭifferent yet equally important restorative work happens during deep sleep (stage 3) and REM sleep (stage 4).ĭeep sleep is crucial for physical renewal, hormonal regulation, and growth. Our brains become busily active in REM sleep, too, even more so than when we are awake. The fourth and final stage is named for the rapid eye movement - REM - that is its defining characteristic. In deep sleep, both brain and body activity drop to their lowest point during the cycle, and blood is redirected from the brain to muscles. As we progress through stages 1 and 2, we become increasingly unplugged from the world until we reach the deep sleep that happens in stage 3. Healthy sleep is divided into four-stage cycles. To understand why the right amount of shut-eye is so important to performance, it helps to know how sleep works. When it gets less, your concentration, creativity, mood regulation, and productivity all take a hit. To complete its work, the brain needs 7 to 8 hours of sleep. When you sleep, your brain catalogues the previous day’s experiences, primes your memory, and triggers the release of hormones regulating energy, mood, and mental acuity. “It’s a necessity for optimal functioning.” James O’Brien, medical director of the Boston SleepCare Center in Waltham, Mass. But the truth is that they’re shortchanging themselves - and their companies. Many hard-charging managers pride themselves on their ability to work long hours and get by on 5 or 6 hours of sleep.
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