I saw a lead photo for this article. A Dutch designer created a floating bed based on magnetic attraction/repulsion. It looks pretty nice. The article talks about folks with piercings not having issues, unless they go underneath it (say to dust or sweep or whatever).
Seems to me I'd probably want to lay off using a laptop in bed too. Any magentic field strong enough to hold my fat butt up in the air, let alone the matteress has got to be strong enought to affect the harddrive.