When the Trekkers, Ms. B, and Professor Katmandu all start nodding off to
sleep continuously, the Trekkers must travel to a great Sand Desert to try and find Mousephus, whose Sand Clock has apparently run amok! The Trekkers must continually fight off their own sleepiness during the Mission, except for Mo, who refuses to believe that he is affected. He keeps repeating he doesn’t need sleep! But when Mo finally falls asleep, a strange dream explains how lack of sleep makes it hard to play and enjoy life, and he wakes up to a new understanding of the value of sleep.