Aside from my own experiences, I have two Daughters who have worked in resthomes for over 12 years. It is so common to them that they don’t even pay attention to it anymore. Just part of the work place environment as you describe.
My parents house has been haunted since it was built. Family, friends and neighbors have witnessed weird things and I have and I believe in spooks to an extent.
My wife worked in a hospital built in the 1950’s which has had remodeling and movement of departments over the decades. She was in administration and finance and that suite which was locked down at 5:00pm was the old ER area 40 years ago. Many nights during month end she would be working late and here people walking around in the office suite outside her office which was at the far end and last office of the suite and doors opening and closing. She would get up and check to find all as should be. Then she would start hearing voices out in the secretary area and walk out and look, it was a straight shot view from her office door to that area, nothing there.
Finally she decided to close her door and crank her radio when she had to work late and drowned out the noise. When finished she had everything shut down and her purse on her arm and she would say aloud time to go and hit the lights and zip down the office suites to the main door and out quickly. She never believed in ghost until she stayed in my parents house and worked at that hospital.