I haven't ( I was fortunate enough to finish both my bachelor's and master's degrees before having my children), but one of my friends went back to finish her MBA. And she commuted to another state to do it! At the time she only had one son, but she had to get on a plane every week! It was only for one school year, but I sure did admire her commitment to finish.
I think if it's something you want to do, you should do it. I don't think you will regret it.