Ever since my family and I moved into our new house, my room has had the wireless router. Recently, however, we moved it to the living room, and since then, my dream vividness has increased greatly.
Also, I remember we used to have a clock that supposedly canceled out electromagnetic radiation in the surrounding environment, and everyone claimed their dreams were incredibly vivid when the slept near it.
So I’m thinking it would be useful for lucid dreamers to sleep as far away from such tech as they can. If there is anything constantly giving off wireless signals, they should move it far from the sleeping area.