PSYC 3390 Lecture Notes - Lecture 13: Actigraphy, Methylphenidate, Triazolam

• School: University of Guelph
• Department: Psychology
• Course: PSYC 3390
• Professor: Meghan Mc Murtry

Document Summary

4 numbered stages of sleep that differ in the depth of sleep involved. 1, the person transitions through wakefulness into drowsiness and the sleep. 2, the person is truly sleeping, yet the sleep is light. 3 involves moderately deep sleep and 4 very deep sleep. Through the night, we show a 90-mins cycle of sleep, progressing from light sleep, to deeper sleep, then back to light sleep, and ending with rem sleep and dreaming. When we awaken in the morning, we typically awaken out of rem sleep during a dream. Normal sleepers spend about 20% of their sleep time in deep sleep, 30% dreaming, and 50% in light sleep. Sleep-wake disorders are divided into two major categories: dyssomnias and parasomnias. The parasomnias are characterized by abnormal events that occur during sleep, such as nightmares and sleepwalking. The clearest and most comprehensive picture of your sleep habits can be determined only by a polysomnographic (psg) evaluation.