Clinical Research Directory

Inclusion Criteria: * Men and women aged 22 to 85 years who visited Seoul National University Hospital with suspected sleep apnea due to symptoms such as snoring, apnea, or excessive daytime sleepiness. Exclusion Criteria: * Patients previously diagnosed with sleep apnea who are currently undergoing treatment (e.g., positive airway pressure \[PAP\] therapy, mechanical ventilation, oral appliances, or surgery). * Patients with neuromuscular diseases or a history of chronic opioid medication use. * Patients with severe insomnia that is not controlled by medication. * Patients receiving supplemental oxygen therapy due to underlying conditions such as heart failure, chronic obstructive pulmonary disease, interstitial lung disease, hypoventilation syndrome, or stroke, or whose baseline oxygen saturation is less than 90%. * Patients with implanted cardiac pacemakers, defibrillators, or other electronic devices. * Patients inexperienced in using smartphones, apps, or smartwatches. * Pregnant women. * Patients unable or unwilling to provide written informed consent.