RecruitingDevice studyPediatric Post-Approval RegistryThis registry is a prospective, multi-center, single-arm study of pediatric subjects (ages 18-21 years) who are undergoing implant of the Inspire Upper Airway Stimulation (UAS) System for the treatment of moderate or severe obstructive sleep apnea (OSA). Implanted subjects will be followed for 5 years post-implant.