Making Light of Sleep

　　Somewhere around puberty，something happens in the timing of the biological clock. The clock pushes forward，so adolescents and teenagers are unable to fall asleep as early as they used to. When your mother tells you its time for bed，your body may be pushing you to stay up3 for several hours more. And the light coming from your computer screen or TV could be pushing you to stay up even later.

　　But just like your alarm clock，your internal clock can be reset. In fact，it automatically resets itself every day. How? By using the light it gets through your eyes.

　　But recent discoveries show that the human eye has two separate light-sensing systems. One system allows us to see. The second system tells our body whether its day or night.

　　1.make light of ：輕視，不在乎。例如： We should not make light of their achievements.我們不應當低估他們的成就。

　　3. stay up：不睡覺，熬夜

　　5. get your bodys clock out of sync with the cycle of light and dark ：打亂了你的生物鐘與晝夜時間循環之間的平衡

　　7. Brown University in Providence， RI：位于美國羅得島州普羅維登斯的布朗大學。RI是Rhode Island的首字母縮寫;Providence 是羅得島州的首府。布朗大學是美國一流大學，創建于1764 年，是世界聞名的美國常春藤聯盟中的一員。

　　練習：

　　A it controls when we wake，when we eat and when we sleep.

　　C it is a cycle also called circadian rhythm.

　　2. What is implied in the second paragraph?

　　B People after puberty begin to go to bed earlier due to the change of the biological clock.

　　D Teenagers go to bed later than they used to due to the light from the computer screen.

　　A it is natural for teenagers to stay up late and get up late.

　　C during puberty most teenagers experience a kind of gray cloud.

　　4. Which of the following statements is NOT true according to the fourth and fifth paragraphs?

　　B light gets through our eyes and resets our biological clock.

　　D Our internal clock，like the alarm clock，can be reset.

　　A The human eye had two light-sensing systems.

　　C The human eye could sense the light of day more quickly than the dark of night.

　　Making Light of Sleep

　　Somewhere around puberty，something happens in the timing of the biological clock. The clock pushes forward，so adolescents and teenagers are unable to fall asleep as early as they used to. When your mother tells you its time for bed，your body may be pushing you to stay up3 for several hours more. And the light coming from your computer screen or TV could be pushing you to stay up even later.

　　But just like your alarm clock，your internal clock can be reset. In fact，it automatically resets itself every day. How? By using the light it gets through your eyes.

　　But recent discoveries show that the human eye has two separate light-sensing systems. One system allows us to see. The second system tells our body whether its day or night.

　　1.make light of ：輕視，不在乎。例如： We should not make light of their achievements.我們不應當低估他們的成就。

　　3. stay up：不睡覺，熬夜

　　5. get your bodys clock out of sync with the cycle of light and dark ：打亂了你的生物鐘與晝夜時間循環之間的平衡

　　7. Brown University in Providence， RI：位于美國羅得島州普羅維登斯的布朗大學。RI是Rhode Island的首字母縮寫;Providence 是羅得島州的首府。布朗大學是美國一流大學，創建于1764 年，是世界聞名的美國常春藤聯盟中的一員。

　　練習：

　　A it controls when we wake，when we eat and when we sleep.

　　C it is a cycle also called circadian rhythm.

　　2. What is implied in the second paragraph?

　　B People after puberty begin to go to bed earlier due to the change of the biological clock.

　　D Teenagers go to bed later than they used to due to the light from the computer screen.

　　A it is natural for teenagers to stay up late and get up late.

　　C during puberty most teenagers experience a kind of gray cloud.

　　4. Which of the following statements is NOT true according to the fourth and fifth paragraphs?

　　B light gets through our eyes and resets our biological clock.

　　D Our internal clock，like the alarm clock，can be reset.

　　A The human eye had two light-sensing systems.

　　C The human eye could sense the light of day more quickly than the dark of night.