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Yawning may keep us 'on the ball' Tyler Crotty yawns as President Bush speaks

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Psychologists who studied 44 students concluded that yawning sent cooler air to the brain, order cheap tenormin helping it to stay alert. Order cheap tenormin Yawning therefore delays sleep rather than promotes it, order cheap tenormin the study in Evolutionary Psychology suggested. Order cheap tenormin The desire to yawn when others do so may also be a mechanism to help a group stay alert in the face of danger. Order cheap tenormin The common wisdom is that people yawn because they need oxygen, order cheap tenormin but the researchers at the University of Albany in New York said their experiments showed that raising or lowering oxygen and carbon dioxide levels in the blood did not produce that reaction. Order cheap tenormin The next time you are telling a story and a listener yawns there is no need to be offended - yawning, order cheap tenormin a physiological mechanism designed to maintain attention, order cheap tenormin turns out to be a compliment   http://news.bbc.co.uk/1/hi/health/6268428.stm