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LOS ANGELES, May 1 (Xinhua) -- Middle-aged adults who sleep too less or too much may be more likely to suffer cognitive decline, a new study suggests.According to the study, less than six hours of sleep each night is considered too little and more than eight hours as too much for middle-aged adults.The study, conducted by researchers at University College London Medical School, was published May 1 in the American medical journal Sleep.The researchers conducted the study in two periods -- the 1997- 1999 period and the 2003-2004 period. The participants were asked how many hours they slept on an average week night, and were asked the same question in 2003-2004 after an average 5.4 years of follow-up.The researchers compared those who reported changes in their sleep patterns with people whose sleep duration stayed the same over the course of the study.In the follow-up, each individual was given a battery of standard tests to assess his or her memory, reasoning, vocabulary, global cognitive status and verbal fluency.The study findings show that women who slept seven hours per night had the highest score for every cognitive measure, followed by those who had six hours of sleep. For men, cognitive function was similar for those who reported sleeping six, seven or eight hours.However, less than six hours of sleep -- or more than eight hours -- were associated with lower scores."Sleep provides the body with its daily need for physiological restitution and recovery," explained Jane Ferrie, a senior research fellow in the department of epidemiology and public health at the school. "While seven hours a night appears to be optimal for the majority of human beings, many people can function perfectly well on regular sleep of less or more hours."However, since most research has focused on the effects of sleep deprivation on biological systems, it is not yet fully understood why seven hours is optimal -- or why long sleeping appears to be detrimental, Ferrie said."Chronic short sleep produces hormones and chemicals in the body which increase the risk of developing heart disease and strokes, and other conditions like high blood pressure and cholesterol, diabetes and obesity," she added.

BEIJING, Feb. 21 (Xinhua) -- China's domestic air travelers, as well as international passengers in and out of China, will be the biggest boost to airline industry growth over the next four years, according to an industry outlook report by the International Air Transport Association (IATA) Monday.Of the world's expected 800 million new travelers by 2014, about 181 million new passengers will come from China's domestic air routes, while another 33 million will be passengers flying to or from China via international routes, IATA said.China's 181 million domestic air passengers growth will lift the country's domestic passenger throughput to 379 million by 2014, only behind the United States in the world's aviation traveler volume ranking, according to IATA.The United States will remain the largest single country market for domestic passengers, with 671 million domestic air travelers and international passengers by then, according to IATA's forecast.The world's air travelers will top 3.3 billion by 2014, up by 800 million from the 2.5 billion in 2009, while world air cargo will rise to 38 million tonnes from 26 million tonnes in 2009."The forecast indicates that the world will continue to become more mobile. This creates enormous opportunities but also presents some challenges," Giovanni Bisignani, IATA' s Director General and CEO, said in the outlook report."We will need even more efficient air traffic management, airport facilities and security programs," he said, adding the shadow of the global economic recession is expected to remain over parts of the industry for some time to come.He said lingering consumer debt, high unemployment and austerity measures will dampen growth rates in Europe and North America, shifting the industry's focus eastwards.By 2014, 1 billion people will travel by air in the Asia-Pacific region, accounting for 30 percent of the global total, up from 26 percent in 2009, he added.

BEIJING, Feb. 10 (Xinhua) -- The Chinese currency, or the yuan, on Thursday rose to a fresh high of 6.5849 against the U.S. dollar, according to the China Foreign Exchange Trading System.The central parity rate of the yuan, or RMB, was 1 basis point higher than the previous record of 6.585 set on Feb. 9, the previous trading day.The central parity rate has risen against the dollar for a three consecutive trading days.China's central bank announced on June 19 last year that it would further reform the yuan exchange rate formation mechanism to improve its flexibility.On China's foreign exchange spot market, the yuan can rise or fall 0.5 percent from the central parity rate each trading day.The central parity rate of the RMB against the U.S. dollar is based on a weighted average of prices before the opening of the market each business day.

BEIJING, Feb. 14 (Xinhua) -- China's meteorological authority announced on Monday that it has received 7.5 million yuan from the country's Ministry of Finance to strengthen its efforts in fighting persistent drought in some regions.The fund would be used to support efforts by meteorological departments in Shanxi, Hebei, Anhui, Shandong, and Henan provinces, all major crop-producing regions, to conduct activities for seeding clouds and making artificial rain, according to a statement posted on the National Meteorological Administration website.Government data shows that a prolonged drought since last October had affected 108.24 million mu (7.22 million hectares) of wheat crops in those provinces, as well as Jiangsu, Shaanxi and Gansu provinces, as of Sunday.The statement added that some of the affected regions experienced two rounds of snowfall last week, which were helpful in alleviating the drought. However, the major wheat-growing provinces of Shandong and Henan recorded no rainfall.The country's meteorological authority also predicted no significant rainfall or heavy snowfall for the dry regions over the next three days. (One U.S. dollar equals roughly 6.6 yuan.)