Well, I don't want to scare you, but maybe think about restructuring your job? I know this wasn't exactly what you asked.
I'm a big believer in maintaining a cash flow positive life: your business has to be cash flow positive & there's no reason this shouldn't extend to your life too - practicing the mindset helps.
So, I'd always counsel against the "quit & go for it" theory - I think it's undisciplined. However, do you really need every dollar that job is generating? Could you restructure your work (this job, another job, etc) to trade off time for dollars?
I do not like the cut into sleep advice. I mean the guys who posted it sound bad-ass to me & it's impressive that's how committed they are. However, creativity & sleep are well linked: I bet you can send 10 more emails if you stay up another hour, but I'm skeptical you can come up with 1 more quality idea.
In the end, work takes time - you should be prepared to pay for the time you need. Your employer pays for it - you have to be willing to too. Don't buy too much (I.e. quit your job) & go cash flow negative, but you can't tell me you can't buy 5 hours a week back. If you can't work less, how about a personal assistant? Money is fungible - you can buy time if you need it. Keep your sleep.
If you've got debt & have no ability to buy some time back, do not work on projects: pay the debt down & get back to a position where you can afford to work at least a little bit for yourself.