alt Hacker NewsWell, GP would have to define "EM fields" a little more precisely, in which case for a subset of such definitions, there would be some experiments possible - strong enough EM fields, or EM fields calibrated to specific frequencies, would then wipe out consciousness (possibly unrecoverably) without seemingly damaging the physical substrate of the brain.
This would finally validate the tinfoil hats! :)
To be fair, I have a room that is a bit of a faraday cage (almost no 5g and really atrocious wifi) and I get much better sleep there than other rooms.