B(2025·江苏扬州中学树人教育集团期末)
Do you play on your phone before bedtime? You may want to read a book instead. According to a US study, looking at screens at night can cause(导致) us to sleep poorly.
In the evening, our bodies make melatonin(褪黑素). Melatonin helps us feel sleepy and relaxed. It is an important part of our sleep cycle(周期). Our electronic screens stop that cycle from working well.
Why? Phones, computers and TVs make blue light. Blue light stops our bodies from making melatonin. Even just a little bit of blue light can have an effect. Eight minutes of blue light can keep your brain “awake” for another hour, according to the study. Even if you fall asleep, you may have lots of dreams. Your brain won't have a good rest.
It's even worse if you play an exciting game before bed. Games make our hearts beat faster, so we have a harder time falling asleep. Then, when we fall asleep, we don't get enough “deep sleep”, which results in poor health.
Use these tips to get a good night's sleep:
Have a relaxing routine every night. Take a warm shower or read a book.
Sleep in a dark, quiet room that is not too warm or too cold.
Count sheep. It's the oldest trick, and it can actually work!
Don't eat a big meal or have caffeine(咖啡因). Instead, drink milk.
Don't run around or exercise three hours before bedtime.
()4.What can we learn about melatonin?
A. It stops our sleep cycle from going well.
B. It makes us feel hungry and tired.
C. Too much of it makes us sleep poorly.
D. It helps us have a good sleep at night.
()5.How can we get a good night's sleep?
A. We can do some reading and take a cold shower.
B. We can run around or exercise for hours.
C. We can sleep in a quiet room with little light.
D. We can eat a big dinner with milk.
()6.What can we learn from the passage?
A. Playing games helps us go to sleep quickly.
B. Our hearts beat more slowly when we play games.
C. It's important to feel sleepy and relaxed before sleep.
D. It's good for us to play interesting games before bedtime.
()7.What is the passage mainly about?
A. How to carry out the study on sleep.
B. What makes people have lots of dreams.
C. Why people should have enough deep sleep.
D. How playing on phones causes poor sleep.