Guess Who?/Sleepless Sleepover

Splash, Dunk and Bubbles try to help a fish that they've never seen before find out who it is and where its home is. / When Splash joins Bubbles, Dunk, and Ripple for a sleepover in the Sandy Bed, they discover that Splash doesn't sleep much; after unsuccessfully trying to help him, they learn that 'schooling fish' don't need as much sleep.