HAMILTON MATTRESS (MGM, $14.95), the charming 30-minute stop-motion work produced by Harvest Films/Egmont Imagination in 2001, is currently available on DVD. The aardvark with a heart that drums, indeed. Sludger (voiced by David Thewlis) dreams of making it big in Beak City with his caterpillar agent (voiced by Henry Goodman) in this light fable from Christopher Moll, the producer of WALLACE AND GROMIT, and director Barry Purves
. The disc includes audio commentary, "The Birth of the Aardvark," a making-of doc and a featurette on the voice work.