Start with distance, not shielding
The single most effective, lowest-cost change in any bedroom is distance from a transmitting device, not a shielding product. Field strength from a Wi-Fi router, phone or smart meter falls off sharply over the first meter or so — moving a router across the room or a phone off the nightstand typically does more than any add-on product.
The handful of changes worth making
Move the router a few feet from the headboard, charge your phone across the room instead of under the pillow, and give a smart meter or cordless-phone base station a little distance from where your head rests for eight hours. These changes cost nothing, are fully reversible, and cover most of the practical ground.
What tends to get overweighted
Consumer “neutralizer” stickers, most shielding paints, and blanket claims about 5G in a bedroom rarely have supporting evidence proportional to their marketing. See our look at shielding physics for why some of these shortcuts don't hold up.
Measure before you change anything
If a specific source is a genuine concern, measuring it first tells you whether a change actually made a difference, rather than guessing. A basic meter and a before/after log beat intuition — see our measurement log.