A survey of junior high school students’ sleep habit and lifestyle in Okinawa. - Arakawa, Masashi; Taira, Kazuhiko; Tanaka, Hideki; Yamakawa, Kenji; Toguchi, Hiroki; Kadekaru, Hatuko; Yamamoto, Yukari; Uezu, Eiko; Shirakawa, Shuichiro (Psychiatry & Clinical Neurosciences, 2001)