Interesting, I drink
three times that just waking up in the morning and then generally drink coffee all day. Last time I saw the Dr, she was a little concerned about how low my blood pressure was.
I drink anywhere from 1/2 to a whole pot (12 "cups") per day, every day. I can drink what I consider 2 cups/mugs (actually probably more like 4 "cups" because I like to drink it from 16 oz styro cups since they stay hotter longer) on a weekend morning & then go right back to sleep, no problem.
My blood pressure is completely normal, maybe even a bit low, despite the fact that in addition to all that coffee consumption I'm also diabetic and that's associated with a tendency to develop high blood pressure (so I only recently found a doc who doesn't insist that I take blood pressure medicine despite my protests that I don't need it - doctors can be idiots too - glad I finally found one who isn't).
However, I do have an abnormally fast heart rate (avg 100 - 120 resting, whereas normal is 60-80). I don't know if that's from coffee, nicotine, just my own body's idiosyncrasy or a combination of them all. I don't have racing heart symptoms, an arrythmia or anything else that might make the doctors (even the past idiots) concerned about it though. I've asked and they all just shrug their shoulders & say not to worry about it since it seems to be normal for me.