Have you ever been tired to the point that you blink & your eyes are a bit slow in opening.... and you see things?
I've had two such experiences in the past week. #1 was while I was sitting in a session in the Orlando Temple. I blinked and before my eyes opened, I saw Jack-Jack climbing around the altar. It was a bit disconcerting.
Not quite as startling as my flight out of Orlando. I was sitting next to a total stranger. During an eyeblink, I forgot that Susie wasn't sitting next to me. As my eyes opened it took a moment or two to figure out what was wrong with my wife... why she was looking so strange. Fortunately I figured it out before I said (or did) anything embarrassing. I'm sure the guy sitting next to me appreciated it.