Good, I’m glad sleeping in the shed works. Typically approaches like that fail because they require ventilation; the EMF can then slip through whatever is used for ventilation. Holland’s tents are used by government embassies — that is the level of the quality of their work. They have specially designed EMF mesh windows with micro-openings that allow ventilation, but prevent EMF. Typically in structures like the ones you’re talking about, I’ve seen EMF readings using a Trifield that are comparable to being outside of one; but if it’s working for you, that’s what matters.