The light is disrupting the body clock, which stems from our evolutionary past when we were active when it was light in the day and resting when it was dark at night. Light alters mood, physical strength and even the way we process food in a 24­hour cycle. Artificial light is known to disrupt the body clock by delaying the production of the sleep hormone melatonin.

　　Prof. Derk­Jan Dijk said there would be no harm in trying to make bedrooms darker. He told the BBC：“People in general are not aware of the light present in their bedroom. I think people should assess their bedroom and see how easy it would be to make it darker.”Street lights, some alarm clocks and standby lights on electrical equipment such as televisions could light a room, he said.“Overall this study points to the importance of darkness，”he concluded.

　　语篇解读：本文是一篇说明文。主要介绍了卧室里的亮度对人们健康的影响：过于强烈的光线会影响人体的生物钟，影响人的情绪，还有可能使人肥胖。

　　8．The passage mainly tells us________.

　　A．bright bedrooms link to obesity

　　B．dark bedrooms link to obesity

　　C．people should turn off lights

　　D．people should buy thicker curtains

　　解析：选A　主旨大意题。第一段第一句点明了文章的主题，即有研究表明，在光线太强的房间里睡觉可能会导致体重增加。故选A项。

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