While all lights are the enemy of sleep, not all colors of light have the same effect. Our eyes are particularly sensitive to blue light, which is common during the day. Most of the light coming from electronic screens is blue light and it fools our brain into thinking it’s still daytime. By contrast, orange or red light has less influence on melatonin production, because our brains recognize it as a signal that the day is ending, according to The Telegraph.

　　Asking yourself to keep your hands off your smartphone before bedtime might seem unreasonable, but you should at least remember to dim the screen or hold it farther away from your eyes. You could also wear a pair of orange sunglasses that take away the harmful blue light.

　　33. According to the passage, we can know ________.

　　A. it’s a good habit to play with smartphones or iPads late into night

　　B. scientists suggest we should avoid using smartphones or iPads

　　C. darkness makes a great impact on the amount of melatonin

　　D. the sun was the only source of light in ancient times

　　34. Which of the following is TRUE according to the passage?

　　A. The darker it is, the more melatonin will be produced.

　　B. The lighter it is, the more melatonin will be produced.

　　C. The more melatonin you have, the worse you’ll sleep.

　　D. The more electrical equipment you have, the more melatonin will be produced.

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