My father suffered a heart attack last year, got 2 stents inserted, and is currently on a lot of medications such as Norvac (can't remember the others). He seems to get sudden spikes in blood pressure of about 170/95~ which always happen at night around 7pm sometimes lasting until 1-2am before it drops down to more normal ranges after taking additional medication, i.e. like Norvasc(140~). These occur maybe once or twice a month (sometimes more often) and we are really concerned.