Children with sleep disorders may suffer from insomnia in adulthood, said German researchers. On the occasion of the 25th anniversary of the German Society for Sleep and Medicine Research in the city of Münster, Germany, Prof. Angelika Schlarb of the University of Berlin said that about 60 percent of children with sleep disorders maintain this problem in adulthood. She has been researching the subject for more than 15 years, and according to her studies, about 10 to 20 percent of children aged six months to four years have sleeping troubles and drowsiness. The German researcher says if any child who has sleeping troubles and drowsiness, for at least three months, several times a week, then he suffers from these disorders. According to Schlarb, sleep disorders in children can have rapid negative consequences because they make children emotionally unstable, they cry more and become aggressive. According to the German professor, these disorders also increase the risk of mental illness, such as depression.