 The primary objective outcome is the proportion of participants compliant at least four hours of use per night for all nights in the Auto Bilevel group compared to the CPAP group after 90 days of treatment during the investigation. Proportion will be calculated using the cumulative number of hours on therapy divided by the total number of days of the investigation for each participant. The mean and standard deviation of these mean therapy hours will then be calculated for each arm of the investigation. Participants with compliance of at least four hours will be classified as compliant and those with less than four hours will be classified as non-compliant. The null hypothesis will be rejected if the mean of the primary objective outcome for all participants in the BiPAP Auto with Bi-Flex therapy arm is significantly greater than that for all participants in the CPAP therapy arm. 