2013 madness after a 4-day off

cant get into sleep its already 6pm. i still have to wake up later around 10pm for my 12-am work shift. being on a company which is so like generous and follows US holidays, we were so lucky enough. we had a shortened work time last friday dec 28,we all came in at 9pm only until 3:30am. then off for a vacation on monday and tuesday! and now, this laziness and not-so-into-reality of getting back to work.