I love coffee, to the point where I roast my own beans and have $2K sunk into a high quality lever espresso maker at home. Before Paleo, I'd have my espresso in the morning, and then I'd drink the crappy coffee at work all day long, too, with 3 tsp of sugar in each one.
When I went Paleo, I quit cold turkey, and my blood pressure dropped from ~145/95, where it had been for years to ~120/75. Then I fell off the wagon, and started drinking black coffee and straight espresso again. My blood pressure came back up to the 130/85 range, depending on how much coffee I was drinking. So some of the hypertension was sugar induced, but not all of it.
I now drink a double espresso every other day, before I work out. My blood pressure is back to usually being anywhere from 115/70 to 120/75.
When I'm not drinking much coffee, I feel much calmer during the day. I don't have issues waking up in the morning without it, and I definitely sleep a little better.