The effects of mediated minimal behavioral intervention on poor sleepers were examined. A behavioral sleep education trial was applied to 114 Japanese workers. The program was designed as a complete self-help approach by means of mediated intervention. The self-checking of sleeping habits, goal setting, self-monitoring, and reinforcement were used as behavior modification techniques. A manual was also referred to. After the intervention, six kinds of sleep-related behaviors were significantly improved. As for sleep, total sleep time was significantly increased, sleep latency, time in bed after sleep offset shortened, and sleep efficiency was also increased. These results suggest that a simple behavioral approach is effective in the improvement of sleep quality.