Any ideas on how to get this done?

I'd like to go back to school to finally finish up with my Bachelors. I'm a single mom, I work full time (get home like 7pm every night), I have no family around to help with my son (If I did decide on night cles), and the last reason is that I can't really afford it right now. What do I do? I have a great yearning for this right now, and I've thought of thousands of scenarios, but none of which would be even close to ideal. My son is very important to me, and he seems to be growing up before my eyes (he's 6 next mth) I'd like to be there with/for him, but I don't see how I can do the school thing without cutting into my time with him. Even if I was to take one or two cles a semester, I still have nowhere to put him. (Plus once again, that'd be less than full time, and I wouldn't get any student loans). Any ideas? Anyone that's done this or having to do this right now? What do you suggest? Please bear in mind that I'm not exaggerating when I say I have NOWHERE to put him.