thats awesome welcome to the multiples club. Its a wild and crazy (yet fun) ride. So are they identical or faturnal? are multiples known to run in her family? So is this your first child/children if so its easier then what ya think. Just remember Routine is key. Never try to break from it and you will be good. Also you really woun't mind the lost sleep (at least I didn't).
My wife was the same boat, at week 23 went into labor (zero survival rate for multiples) needless to say they were are to stop the contractions and she spent the next 2 and ahalf months at OSU in the maturnity ward. We made it to week 31. The boys then spent the next 2 month at OSU and Childrens getting stronger, which was nice it gave Autumn time to recover from surgery.
If you have any questions let me know we have pretty much dealt with all the Highs and lows these past 17 months.