Is this part of the sleep regression?

Kristine

My LO used to sleep from 8:30-5 without stirring, but we are now up at 2,4 and 5. On top of that we are back to pooping around 2 am. Even if I wanted to let him try and put himself to bed I can’t because I don’t want him sleeping in a dirty diaper. He used to do this as a newborn but it stopped for awhile and has now returned. Not sure if it’s part of the sleep regression or something else.