Inspire® Upper Airway Stimulation (UAS) System German Post-Market Study

Inclusion Criteria: 1. Likely suffer moderate-to-severe OSA based on history and physical, or have an established diagnosis of OSA (≥ 15 AHI\<65) based on a prior sleep test 2. Willing and capable to have stimulation hardware permanently implanted, and to use the patient programmer to activate the stimulation 3. Willing and capable to return for all follow-up visits and conduct sleep studies at home, including the evaluation procedures and filling out questionnaires 4. Willing and capable of providing informed consent Exclusion Criteria: Contraindications 1. Any anatomical finding that would compromise the performance of upper airway stimulation, such as the presence of complete concentric collapse of the soft palate 2. Have any condition or procedure that has compromised neurological control of the upper airway 3. Unable or do not have the necessary assistance to operate the patient programmer 4. Pregnant or plan to become pregnant 5. Require magnetic resonance imaging (MRI) 6. Have an implantable device that may be susceptible to unintended interaction with the Inspire system. Additional exclusions for study purposes only: 7. Body Mass Index (BMI) of \> 35 8. Central + mixed apneas \> 25% of the total apnea-hypopnea index (AHI) 9. Any chronic medical illness or condition that contraindicates a surgical procedure under general anesthesia, as judged by the clinical study Investigator 10. Has a terminal illness with life expectancy \< 12 months 11. Active psychiatric disease (psychotic illness, major depression, or acute anxiety attacks) which prevents subject compliance with the requirements of the investigational study testing 12. Any other reason the investigator deems subject is unfit for participation in the study