The Blue Light From Digital Device
More devices like the iPhone, iPad and Kindle produce a blue light that causes our sleep to be restless and disturbed, according to a new study.
The study was led by Dr Paul Gringras, a sleep disorder specialist at a children's hospital in London. Together with her colleagues, Gringras found that manufacturers have started making bigger, brighter, bluer screens in an effort to increase the efficiency of our screens during daytime.But, as an unwanted byproduct, this light is affecting our sleep and productivity.
The study said that this type of light is likely to cause the most disturbance to sleep, as it most effectively overpowers melatonin (褪黑素). a hormone①that reminds us to sleep every night. Besides, using our devices before bedtime could even affect our performance during the day, because exposure to this blue light changes our body's natural rhythms.
“The development of light-producing devices means that for many people, a 'book at bedtime'is now often an‘e-book’,” Gringras pointed out.“Reading a traditional paper book by the light of your bedside lamp doesn't affect your sleep, because bulbs produce a yellow-red light. In comparison, the same book read in electronic arrangement will provide a very different light signal with biological effects.”
The researchers called on all device manufacturers to adjust screen lighting for the sake of the users’sleep quality and overall health.“All hardware devices should have an automatic “bedtime mode”that shifts blue and green light production to yellow and red as well as reduces backlight/light intensity,” Gringras said.
“And, we hope that as technology improves, more and more people will realize that‘brighter’will not always be equal to‘better’,”the researchers concluded.
① hormone: a chemical in your body that stimulates certain organs of your body
_______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________“Life is not easy for any of us. We must work, and above all we must believe in ourselves. We must believe that each one of us is able to do something well, and that, when we discover what this something is, we must work until we succeed.”
—Madame Curie
读了居里夫人的这段话，你有何感想？请结合生活中的具体事例对你的观点加以说明。______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
Are your children getting on your last nerve? Did a coworker's comment rub you the wrong way? There's no need to plug the steam coming out of your ears. In fact, science now gives you full permission to release those emotions; you might actually be happier for it. If that seems counter—intuitive(违反直觉的), hear us out. A new study suggests that people tend to be happier if they can feel and express emotions as they want. That goes for unpleasant emotions like anger and hatred, too.
An international team of researchers recruited 2,300 university students from the United States, Brazil, China, Germany, Ghana, Israel, Poland, and Singapore. They then asked the participants to tell them which emotions they desired and which ones they actually felt, and then compared those responses to how the participants rated their overall happiness or life satisfaction.
The results showed an interesting trend. While participants wanted to experience more pleasant emotions, they reported higher life satisfaction if the emotions they experienced matched those they desired. More surprising still, 11 percent of people wanted to feel less of positive emotions, such as love and empathy, and 10 percent of people wanted to feel more negative emotions, such as hatred and anger.
At first glance, these result might seem confusing. But there's a simple explanation, according to the study's authors. Happiness is "more than simply feeling pleasure and avoiding pain," they write. It is also learning to release negative emotions when you feel them, instead of ignoring them or bottling them up.
"If you feel emotions you want to feel, even if they're unpleasant, then you're better off," lead researcher Dr Maya Tamir from The Hebrew University of Jerusalem told the BBC News website. 71
