The objective of this study is to assess the efficacy of the eXciteOSA device amongst a sample of patients with moderate OSA. The study is a multi-center, prospective, open-label, randomized, parallel-arm trial of eXciteOSA (administered at two doses) versus no-therapy for six weeks. Up to 120 participants will be enrolled, in order to randomized n=62.

Inclusion Criteria:

• Aged >=18 years;
• Diagnosed with moderate OSA;
• Smartphone or tablet capable of running the eXciteOSA app;
• Fluent in written and spoken English.

Exclusion Criteria:

• BMI >=35 kg/m2;
• Implanted medical device;
• Dental braces and/or intraoral metal jewelry;
• Any condition impacting the tissue of the oral cavity, including but not limited to ulceration or periodontitis;
• Symptomatic nasal pathology such as septal deviation, nasal polyposis, or chronic rhinosinusitis;
• Tonsillar hypertrophy (tonsil size grade 3 or greater);
• Clinically significant facial or oropharyngeal abnormalities such as class 2 malocclusion;
• Prior oropharyngeal surgery for sleep-disordered breathing;
• At-home use of a mandibular advancement device or PAP for sleep-disordered breathing within the previous four weeks;
• Use of any overnight therapy that cannot be withdrawn during study enrollment;
• Diagnosed with any sleep disorder other than OSA;
• Chronic use of central nervous system depressants;
• Driver in a sleepiness-related vehicular accident or near-miss within the two years prior to enrolment (self-report);
• Employed as a commercial driver, pilot, or other occupation that may be impacted by hypersomnolence;
• Considered by the PI to be at risk of an AE resulting from hypersomnolence;
• Any periods of non-connectivity (wifi or cellular data) exceeding 48 hours planned to take place, or likely to take place, during enrollment;
• Current or planned pregnancy;
• Member of a vulnerable population, including but not limited to prisoners and those lacking consent capacity;
• Clinically-significant burden of comorbidities (including history of myocardial infarction, cardiac arrhythmia, heart failure, history of stroke, or transient ischemic attack), and/or any other limitation or condition that may impact the patient's ability to complete the study protocol and use the device per the Instructions for Use (PI discretion);
• Employee and/or residing household member who is an employee of a company that produces or distributes products designed to diagnose, treat, and/or monitor sleep or sleep-disordered breathing (including the Sponsor).