Polysomnography (PSG) is performed under monitoring each parameters include EEG derivations, EOG derivations, chin EMG, leg EMG derivations, airflow signals, respiratory effort signals, oxygen saturation, body position and EGG and checking digital video and audio. From these recordings, the sleep quality, sleep-disordered breathing, circulatory status and presence of parasomnia were evaluated. PSGs were based on the criteria "The AASM Manual for the Scoring of Sleep and Associated Events" published in 2007 detailed about technical specification and scoring rules for adult and pediatric. However, there are no specific criteria for the elderly. There already have been known about characteristics for the elderly such as lower amplitude of Δ wave in slow-wave sleep stage, PLMS and RWA in PSG.
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