Is it possible for pressure to rise and fall over the day in a pattern that repeats each day (i.e. a circadian rhythm)?

I ask because of such a pattern in my own case which I have assumed to be Parkinson's. Diagnosed in 2000 and taking Requip and Sinemet.

One set of symptoms that have been an increasing problem for several years is finding myself stuck to the floor with a sudden and overwhelming need to pee. And it starts each evening at about 11:00. Also, cognition problems come at the same time.

Additional meds have minimal impact but going to bed a couple of hours brings noticeable improvement. By morning symptoms have reverted to simple stumbling and respond to meds.

How common is NPH as secondary to Parkinson's, too? Both could be at work.

Any clues?