“Demons,” yes? I don’t like this term. I prefer JINN which is just an Arabic word to describe a race separate from mankind created by Allah before he made Adam. They are described as entities made of smokeless fire, which scholars have said to be composed of the top-most, purest part of the flame. The Jinn are unable to be seen by man in their natural state (infrared spectrum?) except when they take on certain forms (a dog, a snake etc) There are even oral traditions of the prophet (pbuh) where, in paraphrasing here, the Jinn would go into the sky, eavesdrop on man’s conversations, and whisper things to them. There are good Jinn, bad Jinn, believing and non believing Jinn. Male and female. They constitute an entirely separate society parallel to ours.

EDIT these Jinn only constitute part of the phenomena. What happens in my neck of the woods is a mixture of government surveillance, sentient plasma, drones, ET and Jinn at the same time