Patients: Adult subacute (1 to 12 months post stroke) stroke patients 18-70 yrs of age) with moderate to severe OSA (apnea hypopnea index (AHI) ≥ 15/hr) determined by non-attended polysomnography (AHI) ≥ 15/hr of sleep) or level III polygraphy (AHI) ≥ 30/hr of out-of-center sleep testing (OCST), who undergo successful CPAP training and titration (goal AHI< 10) at the neurorehabilitation unit.