轻松英语阅读：灯光的危害

Without a doubt, artificial light has made our lives more convenient. In fact, our modern civilization would not be possible without Edison’s invention. However, scientists are recently discovering that there is a dark side to the artificial light that surrounds us.

It appears that our bodies need the dark as much as the light. Life on earth, including humans, has evolved to match the earth’s 24-hour day. Our body’s built-in 24-hour cycle is known as the circadian clock. Artificial light disrupts our circadian clock by disrupting the production of the hormone, melatonin. According to several studies, lower levels of melatonin can lead to such disorders as depression, fatigue, insomnia, diabetes, obesity or even heart disease. Researchers have also found that the disruption of melatonin production can interfere with cell division and lead to cancer. Indeed, many studies have shown higher rates of cancer among people who work late-night shifts.

Luckily, there are some measures you can take to lower your risks. Here is a list:

1) At night, Limit your use of gadgets that emit high levels of blue light. This includes any kind of LED, such as laptops, most TVs, iPads. etc.

2) If you have to use such devices, use special glasses that block out blue light.

3) Try to use dim orange and yellow lights at night. Avoid using bright overhead fluorescent or LED lights.

4) Expose yourself to sunlight during the day.

5) Try to reduce stress. Increased stress increases the body’s production of cortisol, which in turn lowers melatonin levels.

Hopefully, with these measures you can get on a good sleep cycle and start living healthier.