Researchers in Norway conducted a large-scale study of the relationship between insomnia and heart failure, and found that the presence of several symptoms of insomnia is associated with a dramatically elevated risk of developing heart failure, up to 45%. This study also showed people who slept fewer than 6 hours a night had a 48% higher risk of heart attack, as well as a 15% increased risk of stroke. Sleep disordered breathing, manifested as snoring or obstructive sleep apnea, is associated with higher risk of heart failure, stroke, and coronary heart disease. Poor sleep is also linked with high blood pressure, another well-known risk factor for heart problems and stroke.
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