Diet and exercise are cornerstones of a healthy heart. While they are undeniably crucial, a third often-overlooked pillar is just as important: sleep. A good night’s rest does more than just recharge our minds; it’s a critical period of recovery for our entire cardiovascular system. Think of sleep as your body’s dedicated maintenance shift. While you rest, your cardiovascular system gets a much-needed break from the demands of your waking hours. This nightly restoration is fundamental to long-term heart function. “During sleep — especially non-REM sleep — the body restores itself, blood pressure and heart rate decline, metabolism stabilizes, and the sympathetic nervous system quiets,” explains Dr. Walia. When this process is cut short or disrupted, the consequences can be significant. “When sleep is short or poor in quality, these restorative processes are disrupted, which can negatively affect blood pressure, heart rate, and overall cardiovascular function When sleep is insufficient or fragmented, it triggers a cascade of negative effects that can harm your cardiovascular system over time. These effects range from inflammation and metabolic changes to the direct impact of sleep disorders. Chronic inflammation is a known driver of atherosclerosis, the process where plaque builds up in your arteries. Poor rest can fuel this process. “Poor sleep, sleep deprivation, and disorders like obstructive sleep apnea are linked to higher levels of inflammatory markers such as interleukin-6 and C-reactive protein (CRP),” notes Dr. Walia. These markers are red flags for systemic inflammation, which contributes to an increased risk of heart disease. At the same time, a lack of sleep keeps your stress system on high alert. During healthy non-REM sleep, your sympathetic nervous system activity declines, giving your heart a break. When you don’t get enough quality sleep, this system can remain overactive, leading to higher stress levels and increased strain on the cardiovascular system. Sleep is also essential for regulating your metabolism. It helps control how your body uses glucose and manages insulin sensitivity. When you are sleep-deprived, insulin resistance can increase, which is a major risk factor for developing type 2 diabetes. Furthermore, poor sleep can disrupt the hormones that control your appetite. It can cause levels of ghrelin (the “hunger hormone”) to rise and leptin (the “satiety hormone”) to fall. This hormonal imbalance can lead to increased cravings for high-calorie, sugary foods, contributing to weight gain and placing additional stress on your heart.
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