Duke were you a ghost investigator?It's also possible weather can affect your perception of what you see/experience. During our night at Waverly Hills, there were strong storm cells and lots of lightning in the area. The lightning created numerous instantaneous shadows and "snapshot" views within the open facility that were, at least initially, unnerving. The most striking was seeing a tree limb bring blown around through an empty (no glass) window in a door at the far end of one of the patient wings. With each lightning flash, it would look like someone (or something) was leaning into/looking in the window. We figured out what we were seeing only after viewing the image multiple times and eventually getting to the door and standing outside on the landing during flashes.
We also heard a noise my daughter's friend (a nurse) thought sounded like someone softly grunting in pain. We eventually found what she was hearing, a slow dripping of rain into one of more cavernous areas of the facility. It produced a dull, echo like reproduction of the sound of the water hitting the concrete floor. It never sounded like a person to me, but she agreed what we found was what she had heard.