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

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Yawning may appear the height of rudeness, buy discount metformin online but in fact your body is desperately trying to keep you awake, buy discount metformin online according to research from the US.

Psychologists who studied 44 students concluded that yawning sent cooler air to the brain, buy discount metformin online helping it to stay alert. Buy discount metformin online Yawning therefore delays sleep rather than promotes it, buy discount metformin online the study in Evolutionary Psychology suggested. Buy discount metformin online The desire to yawn when others do so may also be a mechanism to help a group stay alert in the face of danger. Buy discount metformin online The common wisdom is that people yawn because they need oxygen, buy discount metformin online 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. Buy discount metformin online The next time you are telling a story and a listener yawns there is no need to be offended - yawning, buy discount metformin online a physiological mechanism designed to maintain attention, buy discount metformin online turns out to be a compliment   http://news.bbc.co.uk/1/hi/health/6268428.stm