Ohida T, Osaki Y, Doi Y, Tanihata T, Minowa M, Suzuki K, et al. An epidemiological study of self-reported sleep problems among Japanese adolescents. Sleep. 2004;27:978-985.
Chang PP, Ford DE, Mead LA, Cooper-Patrick L, Klag MJ. Insomnia in young men and subsequent depression. The Johns Hopkins Precursors Study. Am JEpidemiol. 1997;146:105-114.
Ford DE, Kamerow DB. Epidemiological study of sleep disturbances and psychiatric disorders. JAMA. 1989;262:1479-1484.