Late-Night Drinking
Melatonin levels normally start to rise about two hours before bedtime. Levels then peak between 2 am and 4 am, before falling again3. Its the neurohormone that controls our sleep and tells our body when to sleep and when to wake, says Maurice Ohayon of the Stanford Sleep Epidemiology Research Center at Stanford University in California. But researchers in Israel have found that caffcinated coffee halves the bodys levels of this sleep hormone. Lotan Shilo and a team at the Sapir Medical Center in Tel Aviv University found that six volunteers slept less well after a cup of caffeinated coffee than after drinking the same amount of decal. On average, subjects slept 336 minutes per night after drinking caffeinated coffee, compared with 415 minutes after decal. They also took half an hour to drop off4 - twice as long as usual - and jigged around5 in bed twice as much.
Because it can take many hours to eliminate caffeine from the body, Ohayon recommends that coffee lovers switch to decaf after lunch.
A melatonin levels need to be raised.
C coffee is a stimulant.
2. Which of the following tells us how caffeine affects sleep?
B Caffeine interrupts the flow of the hormone that prevents people from sleeping.
D Caffeine stays in the body for many hours.
A Different effects of caffeinated coffee and decaf on sleep.
C The fact that the subjects slept 415 minutes per night after drinking decaf.
4. What does the experiment mentioned in paragraph 4 prove?
B There are more melatonin concentrations in caffeine drinkers urine sample.
D Caffeine drinkers produce less sleep hormone.
A coffee lovers sleep less than those who do not drink coffee.
C people sleep more soundly at midnight than at 3 am.
GRE Issue写作提纲思路与分析39
GRE考试写作范文——Issue 147
GRE AWA 范文——Issue 15
GRE考试写作范文——Issue 152
GRE Issue写作提纲思路与分析32
GRE AWA范文 ——Issue 3
GRE issue写作范文:学科
GRE考试写作范文——Issue 154
GRE考试写作范文——Issue 138
GRE AWA 范文 ——Issue 9
GRE考试写作范文——Issue 150
GRE作文话题:高效的领导者的特征
GRE AWA范文 ——Issue 6
GRE AWA 范文 ——Issue 2
GRE考试写作范文——Issue 144
GRE写作提纲思路与分析——issue 184 &70
GRE AWA 范文 ——Issue 16
GRE考试写作范文——Issue 141
GRE issue写作范文:研究经费
新GRE写作Argument范文(一)
GRE高频作文分析与提纲:Issue144
GRE AWA 范文 ——Issue 12
GRE考试写作范文——Issue 151
GRE issue写作范文:伟大含义的判定
GRE考试写作范文——Issue 157
GRE AWA 范文 ——Issue 5
GRE issue写作范文:触类旁通
GRE issue写作范文:法律灵活性
GRE issue写作范文:现代技术
GRE写作话题:质疑精神(Skepticism)
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