Two great questions to ask your rheumatologist. That said, hopefully some members may have experience. The only thing I could find was the following article that mentions heart related inflammation.

-- Myocardial inflammation in polymyalgia rheumatica assessed using cardiac magnetic resonance imaging:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3718596/

From my experience with two occurrences of PMR and I also have hypotension and take blood pressure medications, I never had any pain at night if my prednisone dosage was doing it's job. I took my morning dose regularly around 6 am daily. I've been in remission since 2018 so hopefully others with experience can share their thoughts.

Another tidbit of information is that their are multiple conditions that mimic PMR which may have similar symptoms that you describe which is another reason for discussing it with your rheumatologist.
-- Diseases that mimic polymyalgia rheumatica (PMR): https://www.medicalnewstoday.com/articles/diseases-that-mimic-polymyalgia-rheumatica