What can make insulin requirements go down?

I’ve gone through phases like that & it’s baffling. I wasn’t more active, eating differently, sleep patterns were the same, no other meds or supplements & stress level hadn’t changed. All the usual reasons didn’t apply. My theory is that occasionally our pancreas sends out some insulin. For me, these spurts don’t last long & soon my doses are back to where they were. The only time I took I took basal with no bolus was when I was on antibiotics that caused persistent lows.