Inclusion Criteria:  Between 25 to 65 years of age, inclusive, at the Screening Visit. AHI 10 to 50 (hypopneas defined by 4% oxygen desaturation) History of hypertension controlled with 1 - 2 medications,  Exclusion Criteria:  History of narcolepsy. Clinically significant craniofacial malformation. Clinically significant cardiac disease (e.g., rhythm disturbances, coronary artery disease or cardiac failure) or hypertension requiring more than 2 medications for control. A medication for these purposes is defined by dosage form, such that a combination antihypertensive medication is considered 1 medication CPAP should not be used for at least 2 weeks prior to first study PSG History of using oral or nasal devices for the treatment of OSA may enroll as long as the devices are not used during participation in the study.