BD,
Thanks for your intriguing question.
I would propose to you that the blood pressure surge is leading to the afib, rather than the opposite timing. The episodes you have while trying to sleep sound like symptoms of uncontrolled hypertension. I would consider talking to your doctor about an ambulatory blood pressure monitor.
Hope that helps.
I don't know if Afib can cause high blood pressure but perhaps if your body knows it's coming on, it reacts that way. Totally my thoughts, I am by no means a person in the medical field.
I do know that high blood pressure can trigger Afib. My 16 year old son has a slightly elevated (top number) sitting blood pressure but upon activity his bp sky rockets. Blood pressure does go high during activity but his is higher than that range. Anyway, tests are showing his activity level bp is producing Afib.
While I don't think I have answered all of your questions, perhaps this helps.
Good luck to you!