Abstract
A representation of the human sleep pattern in a useful and compact form is proposed, which can describe, in terms of frequency components, the sleep stages relative to the whole night. The graphic map representing this pattern has been obtained by the poles of a linear filter transfer function applied to intervals of electroencephalographic signals, plotted together inside the unit circle. The maps of 10 patients suffering from angina at rest showed some interesting homogeneities which we investigated with image processing technique and statistical tests. Preliminary results suggest the existence of a sleep pattern peculiar to each subject investigated.
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