Disturbances of respiration during sleep especially those of obstructive character are sufficiently widespread phenomena. In addition to worsening of the quality of sleep itself they facilitate formation and development of concomitant pathology of cardiovascular system, endocrine system, cognitive sphere. This results in lowering of quality of life and its duration. At present standard method of diagnosis of disturbances of respiration during sleep is polysomnographical examination. At the same time more accessible screening methods are also actively used with the aim of detection of subjects with high probability of respiratory disturbances during sleep. Among them cardiorespiratory monitoring, nocturnal pulsoximetry, registration of oro-nasal flow during sleep, are questionnaires most widely-spread.