[Insomnia. A short review of the most important etiopathogenic factors].

The etiology of insomnia remains usually in practice unknown. This article represents basic features of diseases expressed frequently or regularly by disturbances of sleep. Emphasis was layed on psychophysiologic insomnia, narcolepsy, sleep apnea syndrome, periodic legs movements in sleep, restless legs syndrome and on insomnia within circadian dysregulation. Most important neurologic and psychiatric diseases, which can be accompanied by insomnia, are listed.