YES!!! I have a home blood pressure monitor which is really good and accurate. I have good numbers when I take it, however about 2 or 3 weeks before I am supposed to take my DOT physical (for my commercial drivers license) I start getting numbers in the 150's over 90's! I may FEEL calm, but I guess I'm not!
Then to tell you about my friend. She was getting numbers in the 180's over 110's because she is so terrified of high blood pressure (and these were numbers on her home monitor!) She had gotten some kind of bladder test where they put her "out" and her blood pressure was monitored (it was NORMAL all during the procedure!) So my point is, you probably are doing good in your sleep.