Inclusion Criteria:  Age ≥ 18yrs Obstructive Sleep Apnea (OSA) defined as AHI ≥ 5/h Consecutive recordings are possible over 10 nights within 3 weeks Informed consent  Exclusion Criteria:  Age <18yrs No obstructive sleep apnea AHI < 5/h Central sleep apnea events > 25% Patients with implanted active devices (e.g pacemakers, neurostimulators) Multiple night recordings are not possible Insufficient language comprehension in German Pregnancy