I had a quite vivid experience of the awareness of the magnetic fields one night in my underground hideaway under the central park of Sofia... In this case I happened to find a little bag of green stuff inside an empty cigarette packet in my daily street searches and when I smoked it and laid down on my scavenged bed in a room with a 25000W transformer humming away to run the underground tunnel's HID lights, something that had been quite peripheral before, suddenly I could feel the EMF tickling my muscles all over my body.
It was the most vivid experience, and not just because of the sound, I had been dead sober for months prior to this except the occasional beer or found bottle of spirits, I'd got used to mostly sleeping on cardboard in underground tunnels but at this time it was quite comfortable.
A nutter later on set fire to all the rubbish in the chamber around nearby the transformer/power room and the Sofia council locked up the whole area, it used to have a giant ventilation system, thus the big transformer... I had to revert to less secure sleeping arrangements and fortunately a friend came through with some help renting me an airbnb while I hunted for a job, which came through in a couple of weeks after that.