Lack of sleep?
I would think it is. Maybe we should check if there are any hypertensives who regularly get more than 6 hours of "dark" sleep per day? If all hypertensives fail to get their share of sleep, it's highly suspect. And it may be the real, consistent cause of hypertension.
from American Heart Association
from Yahoo! Health
point to one source in the journal, Hypertension, May 2006:
The above articles can be downloaded as PDF:
I was diagnosed hypertensive in the early '90s. It was a time when I slept late and woke up early. I have no BP monitor right now, but I've been sleeping really early (I simply did not allow myself to "recover" from the jet lag of my last US trip), and waking up early. But I've also improved a lot with Tabata interval training.
Well, maybe other factors (carbs, lack of exercise) come into play. But I know of obese, non-exercising persons who are not hypertensive, and really thin persons who are. Could it be the sleep factor?
(Now drug companies might jump into this by pushing sleeping pills more.
I doubt this would be the solution, though. Just get more good night's sleeps.)