Sleep apnea is closely linked to heart health, particularly obstructive sleep apnea (OSA). During apnea episodes, breathing repeatedly stops, causing drops in oxygen levels and surges in stress hormones. These changes strain the cardiovascular system and disrupt normal blood pressure regulation. Untreated sleep apnea significantly increases the risk of high blood pressure, heart disease, heart failure, irregular heart rhythms, and stroke. The risk rises with the severity of the condition. Effective treatment—most commonly with continuous positive airway pressure (CPAP)—can lower blood pressure, reduce heart strain, and improve overall cardiovascular outcomes. Recognizing and treating sleep apnea is an important step in protecting long-term heart health.