Inclusion Criteria:  Aged >=18 years; Diagnosed with mild 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; Temporary or permanent metal implants, dental braces, intraoral metal prosthesis/restorations/appliances, 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or PAP for sleep-disordered breathing within the previous four weeks; Use of any overnight therapy that cannot be withdrawn during study enrollment; Diagnosed with any sleep disorder other than OSA; Chronic use of central nervous system depressants; Driver in a sleepiness-related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; 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, 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).