Inclusion Criteria:  Age greater than 18 years Ability to consent Home sleep apnea test demonstrating mild obstructive sleep apnea. Smartphone or tablet  Exclusion Criteria:  Current pacemaker, defibrillator, or neuro-stimulation device No prior oropharyngeal surgery for sleep apnea No implants, metal prostheses, dental braces, or soft tissue/bony ulcerations in the oral cavity No prior use of mandibular advancement device (MAD) or continuous positive airway pressure (CPAP) Heart failure (New York Heart Association Class 3 or 4; or ejection fraction < 45%) Active coronary disease defined as an intervention (e.g., angioplasty, coronary artery bypass surgery) in the prior 6 months Uncontrolled hypertension (BP > 160/100) Clinician diagnosis of any chronic lung disease except asthma Chronic fatigue syndrome or fibromyalgia Self-reported current illicit drug use in the past 30 days Self-reported use of marijuana or opiates in the past 30 days Use of supplemental oxygen Self-reported use of prescribed or over the counter sleeping medications in the past 30 days Current pregnancy or intention of becoming pregnant Oropharyngeal abnormalities (class 2 or class 3 malocclusion) Periodic breathing (Cheyne Stoke respiration) Central sleep apnea (central apnea index (CAI) > 5/h) Investigator discretion Prisoners