Not an ER nurse, but will an Open Heart/Trauma ICU nurse work??? Oh, yeah, I also work 12 hr nights.
I typically get up about 1545 in the afternoon, workout for just a bit over an hour, then get ready for work. Leave for work at 1815, just in time to clock in at 1855. I work Friday, Saturday, and Sunday nights, take Monday as a rest day then do long sessions on Tuesday, Wednesday and Thursday.
HTH!!!