Many animals do it. Even human babies do it inside the mother’s womb. You do it about 5 to 15 times per day- yawning. As you can see in the picture above, yawning appears ubiquitous throughout the animal kingdom.
Many think that the reason why we yawn is because the brain lacks oxygen. However, according to a recent study, the purpose of yawning is to cool down the brain, or thermoregulation. From previous studies, it was known that rises in brain temperatures were followed by yawns and are followed by temperature decrease afterward.
Research says that putting an icepack to your head can cool down your brain temperature by 32% therefore decreasing the probability of yawning.