This registry is a multi-center, prospective, observational registry, conducted in the United States and Europe. Some data may be collected retrospectively in patients currently implanted (implanted prior to enrollment) through the 12-month follow-up time frame. The CE-marked and FDA-approved Inspire system will be used within its intended use, allowing for of use of any future approved system component models. This protocol does not include any additional stressful or invasive tests, which are not a part of standard of care.