Objective: To assess sleep parameters using polygraphy in the course of treatment of patients with paroxysmal atrial fibrillation qualified for pulmonary vein isolation. Study Procedures: The study involves four polygraphic sleep studies (two before and two after atrial fibrillation ablation), each conducted at least 7 days apart. The polygraphic studies will record the following parameters: pulse oximetry, heart rate, respiratory movements of the chest, and airflow through the anterior nares. The study includes only patients undergoing atrial fibrillation ablation for the first time. Risks and Benefits: The study is non-invasive and does not involve any direct health risks. Participation will not affect your treatment process, but it may provide valuable information about your health status. Voluntary Participation: Participation in the study is entirely voluntary. You may withdraw from the study at any time without providing a reason and without any impact on your ongoing medical treatment. Personal Data Protection (GDPR): In accordance with Regulation (EU) 2016/679 of the European Parliament and of the Council of 27 April 2016 (General Data Protection Regulation - GDPR): The data controller is Primula Clinics sp. z o.o. Personal data will be processed solely for the purpose of conducting this study. Data will be stored no longer than required by law or necessary for the research purposes. You have the right to access your data, request its correction, deletion, restriction of processing, and to object to data processing. All data will be protected against unauthorized access.