Would causes my heart rate and blood pressure to increases at a certain part of day, in my case around 4 my heart rate will increase to high 90s to 100, but most of the day is mid 70s or 80s?

It depends on the amount of activity you have and the expenditure of calories. Good Luck

If these are resting heart rates & not caused by excitement, stimulants or medication, I consider this unusual enough to undergo some investigation for arrhythmia or certain, hormonal abnormalities. A specialist in internal medicine or a cardiologist can conduct the evaluation and order appropriate testing. .