a person who sleeps with his mouth open After using it, when I wake up, I have a headache. I don't know why.

People who sleep with their mouths open or who sleep through their mouths breathe. When using a CPAP machine, air pressure can often leak through the mouth. This causes the pressure to drop and is not enough to treat snoring. Or sleep apnea at that time. In addition, when air leakage occurs, most machines have a pressure compensation function. The machine will blow more air to automatically compensate for the lost pressure. causing the user to receive higher air pressure than usual The higher wind pressure may cause headaches. I recommend using a chin strap in conjunction with the mask. Or change to a full face mask to cover the mouth and nose to solve the problem of sleeping with an open mouth. or breathing through the mouth