"Marva is awake!"

[tt]

Several years ago, on a Unit at the Hospital where I work the Grave Yard Shift, I had just completed my rounds checking on the Patients in my care. All the patients were in bed asleep. All had their room doors shut, and all was quiet on the Unit.
My coworker was in the Nurses' Station doing everything she could to avoid having to come out on the Unit to do any direct Patient care.
This was perturbing to me. Especially when I heard a female voice say to me, "Marva is awake!"
I was P.O.'d that my coworker would tell me this, and not offer to help take care of this Patient's needs. So I decided to wait a bit to see if she would come out of the Nurses' Station to help me. But she never did!
I proceeded down to Marva's room, I opened Marva's door, and sure enough Marva was awake. She was confused about where she was, and kept insisting that she was on a freight train.
I informed her that she was in the Hospital, and on the 3rd floor. I got her tucked back into bed, turned off her light, shut her door and went to the Nurses' Station.
I told my coworker that I had gotten Marva tucked back into bed.
My coworker said, "Oh? Was she awake?"
I said, "Didn't you just tell me 10 mins. ago that she was awake?"
My coworker denied that she had.
So who told me? All the other Patients were asleep in their rooms with their doors closed. ( Hmmm? Marva's door was closed too! )
So who could've known she was up, and awake in her room?
Seems like only a Ghost could've informed me of that fact!