Parallel-Arm Study to Compare AD109 to Placebo With Patients With OSA (SynAIRgy Study)

Inclusion Criteria:

1. ≥18 years of age at the time of informed consent.

2. PSG criteria: AHI of ≥10 and ≤45; ≤ 25% central or mixed apneas; and PLM arousalindex ≤15

3. PROMIS-Fatigue: raw score ≥17

4. PAP intolerance or current PAP refusal.

5. BMI between 18.5 and 40 kg/m2 for men, or 42 kg/m2 for women, inclusive.

Exclusion Criteria:

1. Narcolepsy, restless leg syndrome, REM sleep behavior disorder

2. Insomnia disorder characterized by difficulty initiating or maintaining sleep, oruse within the past month of sedative-hypnotics or other medication for the purposeof treating or avoiding insomnia symptoms.

3. Pierre Robin, Treacher Collins, or other craniofacial malformation syndrome, orgrade ≥3 tonsillar hypertrophy.

4. Clinically significant cardiac disease, e.g., ventricular arrhythmia, untreated orunstable coronary artery disease, cardiac failure. Stable atrial arrhythmia isallowed.

5. Neuromuscular disorder (e.g., motor neuron disease, muscular dystrophy or myopathy,myasthenic syndrome); epilepsy; Parkinson, Alzheimer, or other neurodegenerativedisease.

Exclusion Criteria: