E. Juulia Paavonen, Taina Nieminen-von Wendt, Raija Vanhala, Eeva T. Aronen, Lennart von Wendt. Effectiveness of Melatonin in the Treatment of Sleep Disturbances in Children with Asperger Disorder. Journal of Child and Adolescent Psychopharmacology. March 2003, 13(1): 83–95. http://www.liebertonline.com/doi/abs/10.1089%2F104454603321666225
Singareddy R, Vgontzas AN, Fernandez-Mendoza J ym. Risk factors for incident chronic insomnia: a general population prospective study. Sleep Med 2012;13:346–53. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3319648/