I don’t believe it at all, but my experience was when was working nights years ago and there was 5 of us on shift, 4 working the machines and one spare who was on break relief, The 4 machines were close to each other and the rest of the factory was in pitch darkness and you constantly had a feeling of being watched,
I asked the spare man to jump on my machine while I went for a burst,the toilets were under the stairs which led to the canteen above, while I was in there, there was 100% footsteps going up the stairs above my head and across the canteen floor,
I obviously thought someone had knocked their machine off and went for a brew, but when I came out of the toilet all the machines were manned and I asked who was in the canteen but no one was up there and everyone else was accounted for.
I can’t explain what happened but with being on nights you’re obviously tired and your mind can play tricks, but it’s something that has stayed with me.