It's definitely a shock to the system. You will get used to it in a couple of weeks, definitely. I have to say it was not a bad time not working for 8 months, but now that I have been working for 2 months, I am really enjoying it. It probably took me 2-3 weeks to get used to getting by on less sleep.
I hope you work with some nice people - I think that is the best part about working, finally having a life outside of the one you have with your spouse. Then you have plenty to chat about when you get home at night!
Enjoy the job and the paycheck.