Why Do We Yawn?

5. Reasons For Doubt In The Brain-Cooling Theory

Not everyone is convinced of Andrew C. Gallup, Ph.D.'s predictions. Adrian G. Guggisberg, MD, is a physician at the University of Geneva. He agrees with Gallup in saying room temperature changes can trigger yawning but is not entirely convinced of the brain-cooling theory. Adrian G. Guggisberg, MD, claims the theory is much more social because the body has other ways of regulating body temperature like sweating. He even suggests that we should not yawn less during warm weather because that is when our brains need to be cooled down that much more.