Principles of automatic analysis of sleep records with a hybrid system.

Abstract A program for automatic sleep staging of whole nights polygraphic records of human subjects is described. The electronic system consists of an analog component, performing a first reduction of data, and a digital one, a small general purpose computer. The computer program assesses first the technical quality of the record, by recognition of artefacts, which may impair the diagnosis procedure. It performs second a two steps analysis, based upon electroencephalogram, muscle activity and eye movements. The first step of analysis is a recognition of elementary patterns on the tape and the second step is a calculation of a minute by minute sleep stage diagnosis, based upon these elementary patterns. This program has been tested by comparisons with human scoring of the same records, and has proved to have a good accuracy. This system is actually used as a clinical tool in the exploration of sleep disturbances.

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