I think I had this happen, though not in a scary way.

I used to live with my father in the country in the summers and one summer day I was woken up by him saying, “Get up and get dressed, we’re going into town.” It was probably 7:30 or something, but I did as I was told, threw on some clothes, and went and sat waiting for him. I figured while I got dressed he had wandered back into his room for whatever reason.

Later, my stepmother gets up and is surprised that I’m in my shoes and clothes so early in the morning. “What are you doing dressed?” “Dad woke me up and said we’re going into town.” “He’s in bed asleep…”

It was the first time I remember experiencing a hallucination.