How much would the schooling cost? I would caution you just because here in my home state there are several schools
that offer CNA and MA classes for ridiculous sums of money where the wage you make would never allow you to pay off the loans. This may very well hinder you from going back to school if that is your plan.
My second warning would be that it is very difficult to come home from a 12 hour shift and spend time with kids. You will be tired and will need to have some protected kid free time to sleep.
I would also warn you that what the poster before me said is absolutely true. CNA is a backbreaking job, often demanding, and often lacking in respect which is sad. CNA's are a vital part of the healthcare team and often spend the most time with patients.
What are your future career goals? CNA is like nursing in that it is quite physical and some people find it hard to continue when they get older. Perhaps it would be possible to shadow a CNA for part of a shift? It couldn't hurt to call one of the nursing homes and ask. The worse they could say is no.