Women often yawn for the following specific reasons: First, they may need to relax their bodies, and yawning often lasts about six seconds. During this period, so that the woman closed her eyes and plugged her ears, the whole body’s neuromuscles get a complete relaxation. Therefore, the woman yawn, can make the body, psychological get the best rest, so that the woman has the physical function of protection. Second, some people believe that women yawn is a manifestation of brain hypoxia, the human body through the deep breathing exercise of yawning, so that the blood increased oxygen, discharge more carbon dioxide, thus making women more energetic. Third, when women are sleepy, often yawn constantly to remind women’s brains have been fatigued, need to sleep and rest, so yawning is also a method of hypnosis. Fourth, when a person is about to enter a stressful work before, will also yawn incessantly. This may be the woman with the help of deep breathing, so that more oxygen is added to the blood and improve the vitality of the brain.