CNA while working full time?!

If you do 12 hour shifts, that would definitely be possible. Possibly with 8hr shifts as well, depending on the facility. I currently work 12 hour shifts every other weekend while I'm in nursing school. My facility is great with working around my schedule, just make sure you let them know in any possible interviews!

If you are actually out of work at 3, in some long term care and assisted living facilities second shift runs from 3-11. You could also work weekends, easy. They always need weekends. I think home health care is more flexible as well.

There are some facilities that run 8 hour shifts and allow people to do what's called "double weekends," meaning they work 16 hours each on Saturday and Sunday.

Being a school teacher is a pretty demanding job, though. Grading papers, tutoring students in need of extra help, lesson planning, etc. Even if you had the time, how would you have the energy? Don't your kids deserve everything you can give them? (As the mother of school age children, I think so.) And if you have a family, you probably want to see them sometimes and not be always exhausted and tapped out.

If you do it at all, pick up PRN (as needed) and just tell them you're only available on such and such days and times. I think it's not advisable to do even that, though. But you have to decide for yourself.