I was going to comment on this. As someone going through it now (working for money in the morning, and working on craft in the nights,) it seems that many of my peers who do the same thing are burning out because they charge on until 2-3am, and get up for work at 6-7am.

You aren't going anywhere faster because you work yourself to death. A solid 3-4 hours at night, some great sleep, and I'm good to go. I just expect the payoff (of working on the craft) to come much, much slower than if it were my full time gig.

It works for me, and I take plenty of breaks from working at night because girlfriend, friends, and family would all leave if I didn't. I just take it slow and steady.