Janus II Feasibility

Inclusion Criteria: * Severe sleep disordered breathing * Expected to tolerate study procedures * No heart failure or medically stable heart failure Exclusion Criteria: * Currently implanted with a neurostimulator to treat sleep disordered breathing without sponsor approval * History of severe COPD or pulmonary arterial hypertension * Current or previous history of nerve injury or palsy * Prior cervical surgeries or radiation treatment to head region * Known need for an MRI * History of psychosis or severe bipolar disorder * Active Infection or sepsis within 30 days of enrollment * Currently on kidney dialysis or significantly reduced kidney function * Pacemaker dependance * New defibrillator or any implantable device or device generator changeout within 30 days prior to study implant or anticipated within the first 12 months * Other conditions or anticipated surgical procedure expected to affect ability to complete study procedures * Allergy to contrast dye unless can be prophylactically treated * Known pregnancy or planning to become pregnant