Re: conscious of heart beat
Blood pressure can go up or down very quickly and by quite a lot. Sometimes it can be from very subterranean stressors you didn't even know were bothering you much, let alone hitting you really hard. Caffeine can definitely do it too. I've gone to diners that have blood pressure machines and measured myself before and after eating and guzzling two or three cups of coffee, and damn, it has spiked my blood pressure up like 30 points.
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