Nowadays, people often complain that it is difficult for them to get enough sleep, and the quality of sleep is often poor
When individuals are exposed to light, falling asleep becomes more difficult than before, and sleep is fragmented
 Some experts believe this has something to do with many products of modern technology, such as Changming street lamps, televisions, computers and mobile phones, where the light generated by artificial light sources and electronic devices disturbs sleep and makes it difficult for people to fall asleep