Power Napping is Good for the I.Q.
Today we hear more and more about the importance of getting enough sleep—about eight hours a night. Sleep can help heal and give energy to both the body and the brain. ____1____ It seems almost certain that the third of our lives that we spend asleep has a great effect on the two-thirds that we are awake. Sleep affects our emotions, memory, focus, and behavior.
Studies show that people in developed countries spend less time asleep and more time at work or commuting. Dr. Karine Spiegel, at the University of Chicago, has found that the average length of sleep has gone down from nine hours a night in 1910 to seven-and-a-half hours a night today. However, our bodies cannot function well without enough sleep. ____2____ According to Canadian scientist Dr. Stanley Coren, every hour of lost sleep at night causes us to lose one I.Q. point the next day. For example, when someone gets only five or six hours of sleep each night for a week, the person’s I.Q. could go down 15 points or more. ____3____
Most sleep experts say that humans need at least eight hours of sleep every day, but it should be in two stages: a long sleep at night and a shorter nap in the afternoon. Some companies help their employees follow this advice. ____4____ They say this makes the workers much more efficient.
To study sleep deprivation (not getting enough sleep), scientists use a test called the Multiple Sleep Latency Test (MSLT). During the test, a person stays in a darkened, quiet room during the daytime. Scientists believe that a sleep-deprived person will fall asleep quickly. If it takes ten minutes or longer to fall asleep, the person is probably getting enough sleep.
Scientists have also found that the time of year seems to affect how much sleep we need. ____5____ However, in the summer, people sometimes sleep as little as six hours, without having any problems.
emotion n. 情绪
commuting n. 乘公交车上下班，通勤
I.Q. n. 智商(全称为intelligent quotient)
deprivation n. 剥夺，匮乏
Sleep Latency Test n. 睡眠潜伏期
1.have/has an effect on... 对……有效果的
2.go down from... to...从………降至……
A They allow them to “power nap” in the afternoon, if only for 20 minutes.
B Losing just one or two hours of sleep a night, over a long period of time, can cause serious health problems.
C People usually sleep longer in the winter, sometimes as much as 14 hours a night.
D People in power are more intelligent because they take naps.
E Medical experts now believe that sleep is even more important for health than diet or exercise.
F That’s why, without enough sleep, a normally intelligent person may start to have difficulty doing daily tasks.
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