SAN LUIS OBISPO, CAThe inconsiderate residents of the apartment above Jim Bracker, 23, woke him from a sound slumber several minutes before 3 p.m. Monday. 'Christ, quit with the aerobics already,' a groggy Bracker shouted toward the ceiling. 'You've been jumping up and down for half an hour!' Unable to return to sleep, Bracker resigned himself to channel-surfing until he was forced to drag himself into the shower and ready himself to meet a friend for a 5:15 p.m. movie. 