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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.

"We are determined to further build the quake-hit areas into a prosperous and harmonious land, hoping for more attention and support," he added.

The shaft became flooded at about 10:20 a.m. Thursday, when 23 miners were working underground. Twelve managed to escape on their own, leaving 11 trapped.

An unnamed official with the Civil Aviation Administration (CAA) told Xinhua that passengers rushing into airports' flight control areas violates law and jeopardizing their own safety, hoping passengers will take rational approach to protect their interests.

He said he was grateful for the support of the public throughout the campaign, and it was a privilege of him to serve the communities for the next five years as Chief Executive.