Confused... What should I do?

I'm so tired... It's almost 12.30 am and I'm just done with my work. Have been bring work back home to do and it's never ending and always piling up. Gosh! Sometimes I just feel that I'm being explioted. I really really really feel like quiting but I really does not make sense as I have been waiting for so long for my promotion and now it has come, I'hv got no reason to quit right? Adding on to that, my studies and project are all geting a toll on me. Oh ya!!! My gals turned 1 year old last month. :)