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

This boy's brain may just have been getting warm, discount tazorac online the study suggests

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

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