I'm also a RN and there was a room on the 5th floor everyone said was haunted... so whenever it was empty I did an EVP session and caught an old man voice that said "the pain"... who knows how many people died in that room (was an ICU unit). the bedside table would roll by itself, the tv would turn on and off by itself and it was generally a lot colder than the other rooms on the floor. and yes we checked for drafts we really couldn't explain anything. we actually had patients in there that would ask why another patient was standing in their room or ask to transfer because they felt sick in there but better when walking through the hallways.
I'm a skeptic but that was a really creep room.