Evaluation of Sleeping Comfort of Bed Mattresses with Different Elastic Moduli for Each Body Region

The purpose of this study is to create a method for evaluating the quality of sleep depending on the elastic property of the bed mattress by measuring physiological and psychological responses while sleeping. We executed POMS (Profile of Mood States) before and after sleep, and investigated the change in subjects' moods according to sleep. We prepared bed mattresses that have different elasticity moduli for each body region respectively and 2 bed mattresses. All mattresses are composed of the pocket coil system. We measured the PSG and Actigraph of subjects while sleeping in each bed mattress so that the quality of sleep can be estimated. The PSG is a comprehensive recording of the biophysiological changes that occur during sleep. The Actigraph is a comprehensive recording of the body movements that occur during sleep. As a result, the sleep depth on a bed mattress with high degree of elasticity became deep as shown by the evaluation using PSG and Actigraph. We concluded that there is a posture suitable for sleeping from this experiment.