One that wont make noise.... Metal? Wood? Nail it on the floor? I don't want the mattress on the floor all the time. Somebody help. Edit: I have wood one that had planks for holding the mattress....and after certain use one of the planks broke. Got a metal floor mattress to hold it up now in between the wood frame but its noisy. Maybe I will put sponges around the metal frame so it wont hit against the wood. Or something I dunno.... Thanks for the replies.