 The Rechtschaffen and Kales RK standard PSG parameters include: TST total sleep time, WASO wake after sleep onset, LPS10 latency to persistent sleep, SE sleep efficiency, Awakenings Index number of awakenings per hour of sleep, AI arousals index, sleep stage percentages, PLMI periodic limb movements per hour, and PLMAI periodic limb movements associated with arousal per hour. 