Inclusion Criteria:  Diagnosis of moderate to severe obstructive sleep apnea (apnea hypopnea index [AHI] > or = 15) Previously prescribed positive airway pressure (PAP) therapy Insufficient PAP use (defined as no PAP use over the past 30 days)  Exclusion Criteria:  Severe psychopathology (e.g., active psychosis) that precludes participation in the study Severe unstable medical illness that precludes participation in the study Significant cognitive impairment