I have obstructive sleep apnea. My hospital is the University of Chicago. My sleep doctor suggested that I consider an oral appliance as an alternative to the CPAP machine. I went to Midwest Sleep Center and it was awesome. I went to the downtown location. High-end equipment and service. Most insurances should cover the oral appliance. I had a sleep study done and the appliance resolved my apnea. Hell of a lot better than CPAP.