How to best brave/adjust your system for night shift work?

I've recently got a job as a night manager for a hostel. This involved shifts of 9pm to 9am, 4 days on, 4 days off. It's not ideal, but it's just a summer job. Anyone have tips on how to best adjust your system...foods you can eat to stay awake but not mount up the calories, and things you can do to sleep better during the day?

Thanks,