Nicky,
congrats on your promotion... hehehe... i've been working the graveyard shift (we call it MIDS) for more than 2 years now (i even worked mids in the desert), and i can tell you that it's the greatest shift ever. I won't list all the things I love about it, because i'd rather you find out on your own. but i will give you a couple tips about adjusting sleep schedules. These being from my many months of experience.
drink water. I know it sounds funny, but for some reason, staying hydrated is important for body rhythms... especially when you're about to change 'em. it will be tempting to rely heavily on caffeine, but i strongly encourage you not to do so. that will only dehydrate you and confuse your body rhythms. a little bit once in a while is fine... depending on it everyday is bad.
make yourself stay up when you're supposed to be up, even though the only thing you'll want to do is sleep. by not letting yourself take naps, this will ensure that your body will let you sleep when you need to, which is during the day. (while the rest of the world works BTW)
the most important thing of all is to black out your windows in the room you sleep in. you can do this with a black sheet, aluminum foil, venetian blinds with a blanket on top of 'em, roll down shutters, (those are GREAT!) etc... as i'm sure you know, the sun shining in the window is going to tell your body to stop producing the chemical that makes you sleep... that's bad... you need that chemical. it's mela-somethin'...
the hardest part of being on Mids is adjusting your schedule on the weekends when you're not working. single people with no family around have it easy... they just stay on the same schedule all weekend. they party all night, and sleep all day. their friends get jealous cause they can pull the allnighter and never bat an eyelash. For you this will be much tougher. the little one is still gonna want to hang out on Saturday afternoon with Mommy, when mommy's body is gonna want to be asleep. but alas, i have the answer. what a lot of my co-workers and I do, is we stay up after work on Friday, or we take a very short nap. this allows us to sleep a regular schedule on Friday night, and be up on Saturday morning. (and Sunday)... then on Sunday evening, we'll grab a 4 or 5 hour nap before work, and get set to do it all again. 
that's some free albeit unsolicited advice from a long time midshifter. if you find yourself wondering about anything else in regards to the greatest shift ever, feel free to ask... (if your co-workers can't help ya that is)
good luck!