How do you get a break if they all nap at different times? That must be exhausting!

I agree, get them all on the same schedule. You may have to do it gradually, depending on how young they are, but it can be done. I do the school run twice a day and this time last year had 3 one-year-olds, that all had different nap times when they started. It took a month, and it was brutal, but they all eventually went down at the same time.

I am more of a "go-with-the-flow" parent schedule-wise, but with daycare, I found that the schedule needed to be pretty set. If lunch was pushed back half an hour, that delayed naptime, and the kids couldn't just sleep a bit longer, we had to get to the school at the same time. Now snacks, meals, and naptime are set pretty much in stone, with no more than a 10ish minute difference day-to-day.