I'm not a nurse, I'm a care assistant in a nursing home. Have worked in a few nursing homes over the last 14 years. Not sure I believe in ghosts, but I have had a couple of experiences where I think "well now....".
The first was years ago when I worked in a residential home which was basically a repurposed naval house in the South West. It's got three floors; basement floor, ground floor, first floor and then a flat above it for the owners. Anyway a call bell went off on the first floor while I was on the ground floor and closest to the stairs. This particular stair case has a door to go through to climb it, it is very narrow and only used by care staff really because it's really steep and not very nice. So I go through the door and as I look up, I see a little boy poking his head around the corner and then run away laughing. I heard his feet run away as well. But when I reach the top, there's nobody there. There's only 3 bedrooms with residents up there and only one other door to get back down to the first floor, apart from the one I've just come through. No little boy went downstairs. No visitors as that time either so it wasn't a relative. Who knows....
Second was in a different nursing home (this one used to be a house where young mothers were sent to have their babies years ago), about 5:30am after a nightshift, when I was in the sluice room getting the clinical waste bin to put outside. I had put the laundry roller basket in front of the open sluice door so I could put the yellow bag on top and roll it most of the way and also drop off laundry. So I bent down to do up the bag and I heard clear as day, right in my ear "excuse me love" in a man's voice. Immediately look up and of course there's nobody there. No men on that floor. Husband thinks I was just tired, I'm not so sure.
Third was just this week actually and far less interesting. My current place of work has been a cottage hospital/hospital for wounded soldiers and also had a morgue. I was on a corridor helping on the morning tea trolley and was making a cup of tea when I see in my peripheral vision, some one come out of a bathroom on one side of the corridor and walk straight into a bedroom opposite. The thing is, the bedroom is unoccupied and the door is closed tight. I did check the room, nobody there. What's that about?!
I know people will always say it's a trick of the mind, or you're tired etc but you can never be completely sure in my opinion. I do enjoy hearing experiences from fellow healthcare workers.