I'm a 82 yr old male with sleep aepna. I have been using resmed cpap for 10 t 12 yrs with mask with cushion. I can't breathe well in one side of my nose, when asleep I'm a mouth breather. Lately I wake up frequently nose n mouth very dry, very thirsty. Drink water frequent bathroom trips. Sometimes my reservoir is low or half full? Wake up very fatigued. I'm considering a new cpap machine, or humidifier.. suggestions from other people with same problem?