It's still legal in California to nap when the kids nap.
but with safe sleep regs about to change I suspect at best it'll only be true if you don't have babies in care.
If I'm sick, I gate myself into the play room, pull out a nap mat, and doze along with them. I don't fully fall asleep, but I rest my eyes for sure. They can't get out without waking me up...and I don't have a single kid that wouldn't come poke me in the eye or something if they woke up before I did. Generally...I up before them...because I start hearing them make noise shifting around on their mats. I certainly did it when I was pregnant.