Patent ID: 8622921
Filing Date: 2014-01-07
Classification: A61B

Abstract:
1. A sleep evaluation device comprising: a body movement detector that constantly detects body movements of a human subject lying on bedding; and a determiner configured to: quantify at a predetermined time interval, the results of the detection of the body movement detector as N number of body movement data, in which N is a positive integral number satisfying N≧2, obtain G number of standard deviations for each of G groups dividing the N number of body movement data and for each body movement data included in each group, in which the G is an integral number satisfying 2≦G<N, obtain L number of average values of standard deviations on the basis of consecutive gs number of standard deviations (gs<G), from among the G number of standard deviations, in which L is an integral number satisfying 2≦L≦G, and wherein obtaining comprises calculating the L number of average values of standard deviations for a consecutive time interval of body movement data, and wherein each of the L number of average values of standard deviations is assigned a number, pth, which corresponds to a time of acquiring the body movement data; obtain as a baseline value, from among the L number of average values of standard deviations, an average value of all pth average values of standard deviations that satisfy a condition that an absolute value of a difference between a pth average value of standard deviations and a (p+1)th average value of standard deviations is equal to or is less than a predetermined value, in which p is an integral number satisfying p≦L−1, and determine on the basis of the G number of standard deviations and the base line baseline values, whether the human subject is in a sleep state or is in an aroused state.