The past seven years and three months I have worked a 24/48 shift at the firehouse. Once every third day I would have to be at work for 24 hours. I have been off work since Friday morning and my brain thinks I need to be back at work in the morning.
Luckily for me my new schedule is Tuesday/Thursday 24 hours each day. I still have two more days off! Old habits die hard I guess. Thanks a lot Pavlov!