[Sleep disorders. 1. Classification and incidence]

Twenty years (1963-1983) of experience with polyhypnography (polygraphical all night recordings of sleep: EEG, EOG, ECG, EMG etc.) and ambulatory treatment of insomnia consequently resulted in the fact that sleep disturbances are not easy to classify. Procedure is to evade to framework-diagnosis, whereby only for practical purposes tab. 2 is provided. Approximately 25-32% of the population suffer from sleep disturbances resulting in lack of sleep.