conflicted

So I took a civil service test about 4 years ago and I keep getting letters for job offers. We can't afford daycare so I've had to turn down all the 9-5 but I just received one for 11pm-645am...would I be crazy to take it? I'm genuinely conflicted. Our son generally sleeps through the night but he fights it really hard to go to sleep (he's awake eating right now) and my boyfriend really needs to be able to concentrate while at work. I guess I'm just really conflicted because it would be cheaper health insurance for us and a job within my field but I'd feel like a jerk leaving him with a cranky baby all night. Do any of you work overnight?