What color of light is said to especially affect sleep?

16. Some traditional and anecdotal remedies for insomnia include: drinking warm milk before bedtime, taking a warm bath after exercise, eating a large lunch and then having only a light evening meal at least three hours before bedtime, avoiding mentally stimulating activities in the evening hours, going to bed at a reasonable hour and getting up early, having a catnap in the day if chance permits, and avoiding exposing the eyes to too much light, especially blue light, a few hours before bedtime.
17. The two groups of people, the deifiers and defiers of Confucius, had, however, one thing in common—their blindness. The first group had blindly set up a wooden idol to be worshipped, and the second group, with equal blindness, had set up a straw effigy to be burnt. Neither group really made a serious effort to discover the real Confucius, to understand his problems in the light of his mentality and of the times he lived in.
18. A Chinese space telescope has found a strange peak in high-energy cosmic ray electrons and positrons, which are highly energetic particles blazing across the universe at close to the speed of light. Scientists say they think such an anomaly can help crack the secrets of dark matter, the strangest ingredient in the universe.
19. Every nation, in terms of any of its arts, such as drama, painting, sculpture, or literature, has its own highly developed form to represent it. The Chinese painting is represented by Chinese traditional painting, and Chinese traditional painting by the highly developed literati painting. My reason for putting it this way is that Chinese painting has a history of over five thousand years, counting from the painted pottery of Yangshao Culture: the relics unearthed from Yang-shao Village of Henan Province, and Chinese literati painting has a history of over one thousand years.
20. Anne Tyler was born in Minneapolis, Minnesota, and grew up in Raleigh, North Carolina. Having worked as a librarian at an American and a Canadian university, she finally settled in Baltimore, Maryland, and started writing full-time. Her first novel, If Morning Ever Comes, came out in 1964, and she continued to publish novels, but it was not until about ten years later that her fellow Americans began to appreciate her writing.