Have you ever experienced “shadow people”?

I had just gotten home from the hospital last Thursday afternoon from having a heart ablation. I’m pretty sure that whatever aberrations that I saw were due the general anesthesia. They must have given me a high does of anesthesia because I still feel rummy dummy.
Anyway I had gotten home for a while and was cruising the internet when a slight shadow came over my left shoulder. I thought it was my wife (snooping) and as I turned to look in the direction of the shadow there was nothing there.
Two other times I saw a shadow moving around behind me just off my right side. Of course the shadow completely disappeared when I turned to look at it. One other time a low profile shadow appeared and as I turned to look at it quickly disappeared. But I saw enough that it was running on all four legs.

I’ve never take any kind of recreational drugs including alcohol.

I read that some people are tormented by shadow people.

Is there really such a thing as shadow people?

Have you experienced shadow people?

I wonder what they want.