Whole-night recording of 9-30 parameters and calculation of various indices allow differentiation of various sleep related breathing disorders and estimation of their severity (Fig. 1, 2). Parallel monitoring of changes in ventilation, arterial oxygen saturation, ECG, EEG, EMG and others, give a possibility to appreciate the gradual development of cardiovascular, neuropsychic, endocrine-metabolic and other consequences of sleep related breathing disorders, their dependence on different phases and stages of sleep as well as their alterations by treatment.