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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 mentax no rx required but in fact your body is desperately trying to keep you awake, buy mentax no rx required according to research from the US.

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