Many people feel an unpleasant jolt when the alarm clock goes off in the morning, but waking up can truly be a high-risk time for people at risk of heart attacks. What’s more, heart attacks that happen between 6 a.m. and noon tend to be the most dangerous. The main culprit seems to be circadian-rhythm-based stress hormones that kick in to increase blood flow in the morning. Dehydration and a lower concentration of heart medications in the system after a long night of sleep might also contribute.

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