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You might feel like the healthiest person in the world and yet still randomly die in your sleep. Sudden arrhythmic death syndrome is just one example. There are tons of small obstructions and irregularities that your heart could be suffering from that go completely unnoticed by you, your friends, and your doctors. You might be at an increased risk of just passing on when you go to bed tonight, and no one would even suspect as much until you actually died.