My current mattress is wearing thin (get it?) and I need to shop for a new one. I am daunted. Should I get an off-brand memory foam one online, that'll last about 5 years but be affordable and reliable? Should I get an organic futon made of cotton, wool, and natural latex? I loved coir (coconut fiber) mattresses when I lived in Trivandrum; should I get coir? Maybe I'll just keep sleeping on my increasingly indented mattress so I don't have to think about it.