It is not sufficient to just turn off the blanket because many blankets still produce an ELF field as long as they're plugged into a socket. Because of that, they have become the standard lighting system used in most offices, industry, and now around the home. However, fluorescent lights require a ballast transformer that generates an ELF field. That also applies to the new energy-saver fluorescent lamps that replace standard incandescent bulbs. They are okay for overhead lighting, but you may want to reconsider using them for close-up work or desk lighting.
Television sets fall into the same category as our computer monitors.
Like our monitors, they produce a field that propagates from around the entire set. The ELF field will propagate through standard building materials such as wood and plaster. So if a TV set is placed against a wall, the ELF will propagate through the wall into the adjoining room. So it becomes important not to place a bed against a wall with a TV set on the other side. The small motors in AC-powered clocks also produce ELF fields.