Mattress

       Here's a wiki article on the subject, with images:  http://en.wikipedia.org/wiki/Mattress

            What prompts this post is the 1905 house I live in, where many of the old beds are "full" size.  A century ago people were smaller and two people could fit into a full bed just fine, and sleep just fine. Now that is generally not the case. Said another way, many couples don't like the "full" bed size anymore.