Randomized Study of Provent Versus Sham Device to Treat Obstructive Sleep Apnea

Inclusion Criteria: 1. Age \> 18 years 2. Diagnosis of OSA 3. AHI \> 10 on diagnostic PSG performed within last 3 months 4. Investigator believes that subject can benefit from OSA tx 5. Subject understands and is willing and able to comply with study requirements Exclusion Criteria: 1. Use of any device that interferes with nasal/oral breathing 2. Persistent blockage of one or both nostrils 3. Any chronic sores or lesions on the inside/outside of the nose 4. Chronic use of nasal decongestants other than nasal steroids 5. Oxygen saturation \< 75% for \> 10% of the diag. PSG 6. Oxygen saturation \< 75% for \> 25% of the first 4 hours of the diag. PSG 7. Prior or near-miss motor vehicle accident due to sleepiness (last 12 mo.) 8. Current use of hypnotics, anxiolytics, sedating antidepressants, anticonvulsants, sedating antihistamines, stimulants, or other medications likely to affect neurocognitive function and/or alertness 9. History of allergic reaction to acrylic-based adhesives 10. Current acute upper respiratory inflammation/infection or perforation of the tympanic membrane 11. History of frequent and/or poorly treated severe nasal allergies or sinusitis 12. Narcolepsy, idiopathic hypersomnolence, chronic insomnia, RLS, REM sleep behavior disorder or any other diagnosed or suspected sleep disorder 13. Current use of diurnal or nocturnal supplemental oxygen 14. History of CPAP use in the home for OSA tx 15. History of use of oral appliances for OSA tx 16. History of prior surgery for OSA 17. Currently working night or rotating shifts 18. Consumption of \> 10 caffeinated beverages per day 19. History of severe cardiovasc. disease, including NYHA Class III or IV heart failure, CAD with angina or MI/stroke in past 6 months 20. History of cardiac rhythm disturbance 21. Uncontrolled hypertension (SBP \> 180 or DBP \> 105 mm Hg) 22. Uncontrolled hypotension(SBP \< 80 or DBP \< 55 mm Hg 23. History of severe respiratory disorders or unstable respiratory disease 24. Any other serious, uncontrolled medical condition 25. Females of child bearing age who are pregnant or intending to become pregnant 26. Consumes more than 3 drinks of alcohol/day 27. Chronic neurologic disorders 28. Cancer, unless in remission for more than 1 year 29. Current psychiatric illness 30. Smokers whose habit interferes with the overnight PSG 31. Any known illicit drug usage