[Sternwallow]

Once you see a phenomenon, say a drifting glowing veil in the dark (easily caused by retinal fatigue or unusual pressure in the eye), every other sensation, like feeling a draft, becomes a pall of ghostly cold, a squeek in the floor under your feet becomes the wail of some distant spirit, even a sudden whiff of your own excitment can transform into the aroma of ancient Lilac. This is not superstition nor insanity, it is your very capable mind doing its best to make all of the pieces fit.

On the other hand, just because one is prone to hallucinations doesn't mean that plate didn't slide of the shelf and crash to the floor. Sometimes unexpected and unexplained things do happen without any supernatural cause.

My "floating glowing veil" turned out to be a moonlight-illuminated spider web that was almost totally invisible in normal lighting.