I have used a bi-pap for almost two years. Neber had a Cpap. My pressure is 10/18. The largest problem I have is that it makes my nose run like crazy! I found some interesting research materials that were written by a group of doctors that did a battery of sleep studies on ten myasthenia gravis patients. Six of the ten were diagnosed with central sleep apnea. Central is pretty rare in its own right as it is seen in only one or two percent of all sleep apnea patients. Basically, it is the brain forgetting to tell your body to breathe..