It has been noted in the paranormal field that electro-magnetic fields can affect spiritual activity. Additionally, it has been noted since ancient times that spiritual activity seems to be more frequent at night. Varkadevi has noticed this also, as lights and electrical appliances(while active) seem to hinder hir energy work to a great extent, and energy work of most sorts are nearly impossible during daylight hours. Additionally, this also seems to affect whether or not apparitions will be visible. Which seems to lend some evidence to the fact that these are indeed apparitions are in fact spirits and not hallucinations....as such hallucinations/creepy feelings are typically DUE to high electromagnetic fields.
“A considerable percentage of the people we meet on the street are people who are empty inside, that is, they are actually already dead. It is fortunate for us that we do not see and do not know it.”
- G.I. Gurdjieff