That'll teach me to double check. There doesn't seem to be much to base my blatant and unequivocal statement on.

I did track down what had put the idea in my head though. And it seems to say what I repeated but there is not a lot prior. The question, however, is if we are going hypertensive at night would we know it if we were not checking it ourselves. My apologies.

1: Eur J Intern Med. 2006 Oct;17(6):417-20.

Characteristic findings on 24-h ambulatory blood pressure monitoring in a series
of patients with Parkinson's disease.

Ejaz AA, Sekhon IS, Munjal S.

Division of Nephrology, Hypertension and Transplantation, University of Florida,
P. O. Box 100224, Gainesville, FL 32610, USA.

BACKGROUND: Patients with Parkinson's disease frequently present with
orthostatic hypotension, prompting testing with 24-h ambulatory blood pressure
monitoring (ABPM). The aim of our study was to identify characteristic patterns
of blood pressure changes present on ABPM in a series of patients with
Parkinson's disease. METHOD: We retrospectively identified 13 patients with
Parkinson's disease who had undergone ABPM for evaluation of symptomatic
orthostatic hypotension. The ABPM tracings were analyzed for the presence or
absence of reversal of circadian pattern, postprandial hypotension,
noncompensatory heart rate variability, and average daytime and nocturnal blood
pressure values. RESULTS: Reversal of circadian rhythm was identified in 92.3%,
postprandial hypotension in 100% and nocturnal hypertension in 100% of the
cases. Some 61.5% of the patients exhibited daytime blood pressures in the
prehypertensive range, and 23% had blood pressures in the stage 1 hypertension
range per JNC 7 classification. CONCLUSION: The characteristic findings on 24-h
ABPM in this series of patients with Parkinson's disease were the presence of
reversal of circadian rhythm (93%), postprandial hypotension (100%) and
nocturnal hypertension (100%).

PMID: 16962949 [PubMed]