do a search on mattress or bed metal coils adverse effects etc on the internet. 2tuff at unhived mind, search net, has links I believe. I did not save my links as the coil mattress and metal bed info was really buried in long detailed science and military reports online.
I did a search on metal bed coils and found links from usa and russian scientists and some other scientific links with infrared pictures that showed the metal coils sucking the life energy out of a human while the human sleeps and the hourglass metal coils send that human energy down to ???? thru the bottom of the hourglass metal coil, literally draining a persons energy in sleep using the metal coils as a conduit.
that infrared pic sent me to walmart and target where I bought 2 air mattresses, 49 dollars each and put them atop one another. I sleep great on an airbed and will not sleep on metal again.
there are links out there, buried in military reports and hard to locate scientific studies. 2tuff at unhivedmind, search unhived mind on net and find 2tuff, he may be able to direct you to links, that is who told me about dangers of Zzzz on metal or coils and the health benefits from Zzzzz on airbeds. I love my airbed and would not trade it.