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Researchers at Brigham and Women's Hospital (BWH) hosted 21 healthy participants in a completely controlled environment for nearly six weeks. The researchers controlled how many hours of sleep participants got, as well as when they slept, and other factors such as activities and diet. Participants started with getting optimal sleep (approximately 10 hours per night). This was followed by three weeks of 5.6 hours of sleep per 24-hour period and with sleep occurring at all times of day and night, thereby simulating the schedule of rotating shift workers.
BEIJING, March 18 (Xinhua) -- The Chinese capital was blanketed by spring snow on Sunday morning, after a day of heavy fog that has grounded hundreds of flights in the country's north.
LANZHOU, Feb. 11 (Xinhua) -- Northwest China's Gansu Province, home to the country's earliest nuclear base, plans to draft a new law on radioactive pollution control this year, the local government said Saturday.
BEIJING, March 14 (Xinhua) -- The National People's Congress (NPC),China's parliament, adopted Premier Wen Jiabao's government work report Wednesday at the closing meeting of its annual session.
GUIYANG, April 26 (Xinhua) -- The extraordinary effects of Chinese herbal medicines have fueled foreign interest in launching research projects into the profitable and interesting field in recent years.
来源：资阳报