Can a sleep machine keep your heart in rhythm?

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Symptomatic paroxysmal or persistent atrial fibrillation: 1. Paroxysmal: at least having one episode every month for the last recent 6 months. Each episode with symptoms lasting for over 30 minutes and at least one episode is documented (≥30 seconds episode length, documented by ECG). 2. Persistent: lasting over 7 days to 1 year persistent AF with ECG documented. * Implement a rhythm control strategy, including: 1. Ablation and restored on sinus rhythm after the procedure. 2. Underwent medical or electrical cardioversion during hospitalization and restored on sinus rhythm before enrollment. * OSA diagnosed with PSG test showing AHI≥10; * 18 ≤ Age ≤ 75; * Willing to participate in the study; * Able to provide informed consent; * Having access to smartphones and the internet, and be capable of using them. Exclusion Criteria: * BMI \> 30 kg/m2; * LVEF ≤ 40% or HF with NYHA III/ IV; * Other atrial arrhythmias, atrial flatter; * Myocardial infarction; * Hypertrophic Cardiomyopathy (HCM); * Congenital heart disease; * A clear diagnosis with heart valve diseases (including moderate-severe mitral stenosis/ insufficiency, moderate-severe aortic stenosis/ insufficiency); * Hyperthyroidism heart disease; * Other acute diseases leading to temporary AF; * In surgery perioperative period; * Accepted other cardiothoracic surgery except for ablation; * PSG test showing mainly central apneas (Cheyne-Stokes breathing); * Pulmonary diseases causing dyspnea at rest or on minimal exertion; * With other active major organ system disease that is not suitable for study participation, such as cancer, severe liver diseases, severe kidney diseases, etc.; * With significantly impaired cognitive function, having severe problems in learning, memory, perception, and problem solving, and are unable to understand or not be competent to the informed consent; * Having already accepted treatment to the sleep apnea syndrome; * Having received intervention in any other trial within 30 days prior to the planned recruitment.