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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, hairball chews cats overnight delivery the study suggests

Yawning may appear the height of rudeness, hairball chews cats overnight delivery but in fact your body is desperately trying to keep you awake, hairball chews cats overnight delivery according to research from the US.

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