Why am I sleeping with my mouth open?
For some people with sleep apnea, it may become a habit to sleep with their mouth open to accommodate their need for oxygen. Stress and anxiety can also cause a person to breathe through their mouth instead of their nose. Stress activates the sympathetic nervous system leading to shallow, rapid, and abnormal breathing. How can I stop sleeping with my mouth open? If you struggle with mouth breathing when you are sleeping, try changing the height of your head.