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Coffee lovers beware. Having a quick "pick-me-up" cup of coffee late in the day will play havoc with your sleep. As well as being a stimulant, caffeine interrupts the flow of melatonin, the brain hormone that sends people into a sleep. Melatonin levels normally start to rise about two hours before bedtime. Levels then peak between 2 am and 4 am, before falling again." It’s 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 caffeinated coffee halves the body’s levels of this sleep hormone. Lotan Shilo and a team at the Sapir Medical Center in Tel Aviv University found that six volun A. Different effects of caffeinated coffee and decaf on sleep. B. Different findings of Lotan Shilo and a team about caffeine. C. The fact that the subjects slept 415 minutes per night after drinking decaf. D. The evidence that the subjects took half an hour to fall asleep. 更多"{{B}}第二篇{{/B}} {{B}} Late"的相关试题: [单项选择]{{B}}第二篇{{/B}}
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