I used to work 10pm-7am. It was nice at first because it was something different. Once the excitement wore off I found myself getting tired and all my life had become was sleep, eat and work. I would sleep way longer than needed. I now work 5am-130pm and I love it.
In your situation I don't know what I would do. Is there a choice to go back if it doesn't work out for you? The only issue I would have is you schedule would be really out of whack. There would be no real acclimation to the overnights because you're swapping on/off for 7 days.