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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.

TAIPEI, Jan. 23 (Xinhua) -- Five crewmen, including four Chinese mainlanders, had been rescued after their fishing boat from Taiwan's Keelung capsized Friday night off southern Taiwan's Kenting, local sources said Sunday.The other two crewmen, including the Taiwanese captain and one mainland fisherman, were still missing. The rescue efforts were still under way.The fishing boat was ravaged by strong winds and huge waves Friday night.

BEIJING, Jan. 31 (Xinhua) -- The Ministry of Culture, along with seven other central departments, announced on Monday the launching of the "parental watch project" in the online games industry beginning March 1.The project will require online game companies to set up a web page, enquiry hotline and other special channels for parental supervision of their children.Besides, these companies shall authorize parents, who want to monitor and control their children playing online games, to take measures to limit or ban the playing.Also, the online game companies shall provide help to parents in supervising their children's online game accounts and preventing them from playing improper games, as part of the project.The culture ministry tested the project in several online game companies in Feb last year, which proved effective in helping juveniles overcome addictions to online games.

BEIJING, April 14 (Xinhuanet) -- Computer sales declined in the first three months of this year for the first time since 2009 worldwide.PC sales fell 1.1 percent in the first quarter to 84.3 million worldwide, according to tech research firm Gartner Wednesday, well short of its forecast for 3 percent growth.The dip was the first since the second quarter of 2009, when most of the world was still in the grip of economic turmoil."Although the first quarter is traditionally a slow one for PC sales, these shipment results indicate potential sluggishness, not just a normal seasonal slowdown," said Gartner, in a statement.Consumers select IT products at an IT fair named "Sham Shui Po computer festival" in Hong Kong, south China, Feb. 15, 2011. The eight-day IT fair kicked off here Monday. Some 600,000 people are predicted to visit the fair.Weak demand for consumer PCs was the biggest drag on the market, according to Gartner principal analyst Mikako Kitagawa."Low prices for consumer PCs, which had long stimulated growth, no longer attracted buyers," Kitagawa said."Instead, consumers turned their attention to media tablets and other consumer electronics."After Apple's second-generation iPad was released in February, many consumers either switched allegiances or simply held back from buying PCs, according to the analyst.Japan was a particularly weak spot, with PC sales falling 13 percent in the quarter, as people focused on getting back to normal after the March 11 earthquake and tsunami rather than spending money on new technology.