A Mattress With Memory

A post or two ago, I wrote about wanting a new bed. Well, now I'm wanting a new mattress. Not just any old mattress, mind you. It has to be a memory foam mattress!

Not that I really know what the heck a memory foam mattress is but it does sound pretty high-tech :D I wonder how much of memory it comes with? 16GB? 32GB? Or better yet, 64GB?