I've noticed consistency helps. Your body could just be getting used to waking up at a different time, being active at different hours, etc

I've noticed similar things. Our gut is complicated and I assume this sort of thing happens for reasons we don't immediately observe. Maybe (just a hypothetical)waking up earlier interrupts your sleep cycle which can stress your gut and then your bowels don't have as much time to settle back down because you're rushing without realizing it or eating faster or some other small thing. My point being it's not really the change in time so much as the smaller circumstances that go with that change that you might be able to adjust if you can pinpoint them.

I always worked afternoon shift at work when I worked. This was fine on the 5 days I worked on the other 2 I was so ill and still after not working for 2 years my stomach can't handle the change in routine. When I was finally referred to a gastroenterologist after 20 years of problems (and not being believed) I was told that doing shift work was probably one of the things that made my stomach as bad as it was.

I have that problem too. A coworker of mine has IBS too and she said that always happens to her as well. We both work early morning and it doesn't matter what time I get up, I always have flare ups right before work.

I have my worst ibs flare ups every morning, always in 2-3 rounds. It definitely makes working in the morning (every other Saturday) a miserable nightmare lol.

Mornings are significantly worse for many conditions. When i have diarrhea it is always within an hour after waking. My POTS is very similar. My doc signed ADA paperwork for working from home. I can now keep the heart rate lower and avoid the escalating to ER visits. My doc visits etc are all after 11am

Sounds like the body isn't used to it yet. A small change can do that. It likes routine. 🙌