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Mattresses are friendly, dim-witted, docile creatures capable of speech. They are all called Zem and live in the swamps of Squornshellous Zeta. Many of them are slaughtered, dried out, and shipped around the Galaxy to be slept on by grateful customers, though they don't appear to mind this. Many of the movements they make, such as gupping and willomying, are so unique that etymologists have driven themselves half-insane tracking down new words for them.