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Since obstructive sleep apnea (OSA) is known as a common cause of secondary hypertension, it is necessary to consider OSA a differential diagnosis in treating patients with hypertension. Apnea during sleep causes temporary and repeated hypoxia and subsequent sympathetic nerve activation. Furthermore, dysfunction of endothelial cells due to hypoxia is considered another mechanism leading to enhanced stiffness of the elastic artery and eventually, elevation of blood pressure (BP). As a result, OSA induces a nighttime or morning surge in BP,