Why I Don't Like ER

I'm on two weeks of ER right now, and it's definitely not my cup of tea. It's not the medicine I don't like, it's the shift work. I don't have set day or night shifts and my body is not used it. I went from an 8a-4p shift to a 1p-3a work day the following day. It's only 4 days into this rotation and I'm exhausted. I slept 8 hours last night, but I feel like I could go back to sleep--I think I have to play catch up. In fact, I'm going back to bed for a little since I work 6p-2a tonight and I can.