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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, chromonexin free sample the study suggests

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

Psychologists who studied 44 students concluded that yawning sent cooler air to the brain, chromonexin free sample helping it to stay alert. Chromonexin free sample Yawning therefore delays sleep rather than promotes it, chromonexin free sample the study in Evolutionary Psychology suggested. Chromonexin free sample The desire to yawn when others do so may also be a mechanism to help a group stay alert in the face of danger. Chromonexin free sample The common wisdom is that people yawn because they need oxygen, chromonexin free sample 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. Chromonexin free sample The next time you are telling a story and a listener yawns there is no need to be offended - yawning, chromonexin free sample a physiological mechanism designed to maintain attention, chromonexin free sample turns out to be a compliment