Myofunctional Therapy for Obstructive Sleep Apnea

Inclusion Criteria: * Adults aged 18-65 * New diagnosis of OSA (AHI ≥ 5) or failure of first-line OSA treatment * Willingness to forego first-line OSA treatment or stop current OSA treatment for 3 months Exclusion Criteria: * Medical comorbidities that require restricting fluid intake (e.g., dysphagia, renal disease, liver disease, hyponatremia) * Severe nasal obstruction * Severe ankyloglossia * Craniofacial abnormality * Severe pulmonary disease * Severe post-traumatic stress disorder (PCL-5 \> 33) * Very severe insomnia (ISI \> 22) * Body mass index (BMI) ≥30 kg/m2. * History of TBI * Known oropharyngeal or esophageal dysphagia * Pregnancy * Allergy to topical anesthetic * Inability to fast for 6 hours * Recent facial trauma * Recent nasal, pharyngeal, laryngeal, or esophageal surgery * Known nasal, pharyngeal or esophageal obstruction * Current upper respiratory infection * Insufficient internet/computer access to participate in remote study visit * Severe excessive daytime sleepiness (risk of motor vehicle accidents) * Heart failure, recent stroke, heart attack, etc. * Nasal Obstruction Symptom Evaluation (NOSE) Scale \>15