Feel like circadian rhythm is off. Have bowel movement 4:30 am every morning for over a month now. I used to go at 9 am. Why is this?

Hard to say but... Indeed, it does sound like your circadian rhythm is off, but the mystery is why and how to change it. We still have a lot to learn about the causes and treatments of such imbalances, but both chinese medicine (acupuncture) and homeopathy has means of addressing this, so consider those approaches if you want to try to bring this back into balance.