Zombie mode


I have a 4 week old newborn. I am a single FTM and not getting more than 3 hours of sleep a night. Baby girl likes to be up all night until 1 or 2 am consistently. I am self employed and returned to work on Monday. I am falling asleep at work which is unacceptable. I would have loved to take off 12 weeks but no work = no income and bills still have to be paid. Any suggestions on how to get her to sleep??? So that I can sleep too!