All i can say is c'mon people it's a CAT! If people were more observant a trend would be noticed. In this case the humans were observant. This "phenomenon" has been noticed for thousands of years.
Cat's don't have the reputation they have for nothing. (that being of their connections to the spiritual realm)
It sounds like this particular one might be what is known as a Gatekeeper though.

That's pretty neat!
It might not be that he's grumpy or aloof with people but that he has a job to do and probably helps out more people than just those at the hospital. Or on the other hand he could be just grumpy... wouldn't you if you had to deal with confused souls all the time?
(Of course i know the scientific people will pick it apart. ...and why shouldn't they. I agree with them also that there are clues our pitiful human senses just don't pick up.)