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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.

LUQA, Malta, Feb. 26 (Xinhua) -- A chartered plane of China Eastern Airlines carrying 272 Chinese evacuees from Libya left Malta for Shanghai on Saturday.The Airbus A330-300 plane took off at 8:20 p.m. local time ( 1920 GMT) from the Malta International Airport, to be followed shortly by another chartered plane of China Eastern Airlines with 278 Chinese evacuees on board.The 550-strong Chinese nationals from a Chinese construction company were among a total of 2,216 people who arrived by a ship from violence-torn Libya at the Grand Harbor in Valletta, capital of Malta, on Saturday.In addition to the 2,216 Chinese nationals, the ship chartered by the Chinese embassy in Malta also carried dozens of citizens of other countries.The vessel, which was the first Maltese ship chartered by the Chinese government to evacuate Chinese nationals, left Libya's Benghazi on Friday.Maltese Deputy Prime Minister and Foreign Minister Tonio Borg, who went aboard the ship, expressed gratitude to the Chinese government for helping to evacuate some Maltese nationals from Libya.Chinese Ambassador to Malta Zhang Keyuan also thanked the Maltese government for its cooperation in the evacuation of Chinese nationals.A 19-day-old baby was among the evacuated Chinese, said a source with the Chinese embassy.China Eastern Airlines will fly four planes every day to the Mediterranean island nation from Feb. 28 to March 10, as part of all-round airborne evacuation missions aimed at taking stranded Chinese citizens back home as soon as possible, according to information from an emergency meeting of the Civil Aviation Administration of China (CAAC) in Beijing on Saturday.

SYDNEY, May 27 (Xinhua) -- A toddler and a policeman have become the latest victims of a rare and potentially deadly mosquito-borne disease in Western Australia (WA), local media reported on Friday.The two-year-old child contracted Murray Valley encephalitis (MVE) in the Kimberley of WA and is now in Royal Darwin Hospital in a stable condition, according to Australian Associated Press (AAP).The 29-year-old police officer, who was recently contracted the disease at an Aboriginal community of WA, has emerged from a coma in a Perth hospital but is still unable to communicate.It is not known if the victims from WA's far north will fully recover.In April 2011, a man who had been traveling in WA's northwest became the first person in the state to die from the disease in three years.A 19-year-old Canadian tourist also died after contracting MVE while traveling through the Northern Territory earlier in May.A WA Health Department spokeswoman said nine West Australians had contracted MVE so far in 2011. Several people remain very ill in hospital, she said.

BEIJING, March 15 (Xinhuanet) -- The number of Alzheimer patients is growing rapidly, so is that of unpaid caregivers, says a report released Tuesday by the Alzheimer's Association.Nearly 15 million caregivers, most of them family members but also friends, are providing billions of hours of unpaid care for Alzheimer's patients and other forms of dementia in the U.S. — 37 percent more than last year, the report says.Alzheimer's is the sixth leading cause of death in the nation, and the only one among the top 10 that have no prevention or cure, says William Thies, chief medical and scientific officer of the Alzheimer's Association.However, if people were more aware of early symptoms and were diagnosed sooner, then planning could help ease stress on patients and caregivers, according to Beth Kallmyer, senior director of constituent services of Alzheimer's Association."The toll on families is devastating," says Kallmyer, "Stress is extremely high, and one-third are experiencing depression."The time and stress of caring for an Alzheimer’s patient takes a physical toll, translating into nearly 8 billion dollars worth of extra health care costs for caregivers, the report says.

BEIJING, Jan. 21 (Xinhua) -- Chinese Vice Premier Hui Liangyu on Friday urged local governments to step up efforts in protecting agricultural production as winter wheat growing regions in the north of the country have been suffering due to the prolonged drought.Hui warned that the drought could cause great harm to agricultural production.Rainfall in north China, including provinces of Shanxi, Hebei and Shandong, has decreased 20 to 90 percent from the average rain in the same period since October last year.Chinese Vice Premier Hui Liangyu (C) speaks at a meeting on anti-drought and disaster reduction, in Beijing, capital of China, Jan. 21, 2011. Hui Liangyu on Friday urged local governments to step up efforts in protecting agricultural production as winter wheat growing regions in the north of the country have been suffering due to the prolonged drought.Hui urged local departments to improve meteorological monitoring and analysis of the drought, and provide training and services to farmers in order to reduce losses brought about by scarce rain.He also called on local governments to step up construction of more water conservancy projects to better cope with dry weather.Meanwhile, the drought in the north is compared with the intensive icy rain and snow in south and southwest China. A lingering cold spell has been wrecking havoc in these regions, disrupting vegetable production, transportation, and supplies of daily necessities.Hui said the central government would also beef up support in helping these affected regions resume agricultural production as soon as possible.