[Insomnia in children].
This article reviewed the insomnia in children, according to the second edition of the international classification of sleep disorders. In addition, Yonaki (sleep-related night time crying) and the consensus statement on pharmacologic management of insomnia in children and adolescents were introduced. Furthermore, a novel clinical entity-asynchronization-, parts of whose symptoms were presumable due to the behaviorally induced insufficient sleep syndrome due to inadequate sleep hygiene, was also introduced.