Obstructive sleep apnea (OSA) affects approximately one third of patients with epilepsy. Treatment with Continuous Positive Airway pressure (CPAP) is associated with improved seizure control, but is difficult for patients to tolerate. Patients with epilepsy and co morbid OSA may be at higher risk of recurrent seizures if they are noncompliant with CPAP. This study investigates short-term compliance with CPAP therapy in patients with OSA and epilepsy, as this can predict long-term adherence. Identifying factors influencing compliance rates in this population may help improve compliance and reduce seizure recurrence rate in this population. We also investigated the impact of epilepsy on sleep, and the possible effects this has on CPAP compliance.