In addition to being a mouth breather, I do not know if I also have sleep apnea since I wake up several times during the night. If I have sleep apnea, it causes chapped lips due to more air passing over lips. Mouth breathing and sleep apnea is a double whammy for chapped lips. I hope my primary care doctor agrees to a home sleep test for insurance authorization. I do not think I could fall asleep at a sleep lab.