I met with Dr. I today to discuss the results of my last sleep study. He said my daytime sleepiness is caused by sleep apnea, pure and simple. No narcolepsy, just obstructive sleep apnea. When I had the nose mask on a low airflow (6) I had about 10 disturbances per hour with snoring. When I had a full face mask on medium airflow (9) I had only 2 disturbances over several hours with no snoring. He said if I stick with this mask with a chinstrap, I should have marked improvement in a few weeks. So now I get to put on this lovely mask along with my bedtime attire. Sexy, eh?