Can those enigmatic underlays really support you sleep better, or can they contribute to insomnia?
Answer:
They will make no difference. We on floor are surrounded by the earths fascinating field so powerful that it deflect the solar wind and allows us to live on this planet. So you are already immersed contained by a huge magnetic corral and if you can't sleep adding a small puny nought of a magnetic paddock will do nothing.
I enjoy not tried them personally; so the following information is hearsay.
Wolfgang A friend living within Colorado tried one of those magnetic things beneath his sheet, and he reported much success next to it, and as far as I know he is still using it.
You might want to search on the internet where on earth peole have reviewed their value.