Polysomnography Study Guide

Advanced sleep phase syndrome (ASPS) CORRECT ANSWER Cicadian rhythm disorder, phases of daily sleep/wake cycle are advanced with respect to clock time. Sleep phase occurs well ahead of conventional bedtime with tendency to wake up too early; usually involving the elderly Alpha intrusion CORRECT ANSWER brief occurrence of alpha activity during a stage of sleep. Alpha rhythm- EEG oscillation prominent over the occipital cortex, with a frequency of 8-13 Hz I adults: indicative of wake state; present in most but not all adults, most consistent with relaxed wakefulness or painful sleep. Apnea CORRECT ANSWER period of time during which breathing stops or is remarkably reduced. 2 types: obstructive (common) and central (not so common) Apnea-Hyponea index CORRECT ANSWER number of pauses in breathing or insufficient breathing usually with decrease in oxygenation events per hour of sleep. Arousal CORRECT ANSWER Swift changes of EEG frequency for at least 15 seconds taking place in any sleep stage Arousal disorder CORRECT ANSWER type of parasomnia involving atypical arousal from sleep Arousal Threshold CORRECT ANSWER ease with which sleeping person is awakened Awakening CORRECT ANSWER period of more than 15 seconds of straight wakefulness