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Sleep deprivation negatively impacts heart health by increasing the risk of hypertension, heart attack, and stroke. Lack of sleep raises stress hormone levels, like cortisol, which can elevate blood pressure and heart rate. It also disrupts metabolic functions, leading to obesity, diabetes, and inflammation—all key contributors to heart disease. Chronic sleep loss affects the body’s ability to regulate blood sugar and cholesterol levels. Additionally, poor sleep weakens the immune system and promotes plaque buildup in arteries. For a healthy heart, adults should aim for 7–9 hours of quality sleep each night to support cardiovascular function and overall well-being.