I know this is an older post, but doing MBA homework now. Decided to Google working full time, MBA full time and this post showed.
Well, I can say this - I am mentally fatigued most of the time, usually finishing my school projects at the 11th hour, juggling the one child I have left (oldest one finally in college, but luckily other kid 50% of time), and right now very tired while I attempt to gather any energy leftover to work on even a small amount of HW.
I work as a Senior Project Manager and still have to have my brain functioning during the day. I have no idea how I do this, but I am.
My program is also online and works for me. As to attending a brick and mortar school, at this point in my life, would not coordinate well with schedule.
So if you want no life, go ahead and do it!!