PSYCH101 Lecture 4: Lecture 4 - States of Consciousness SLEEP Scientific History Sleep Onset Functions of Sleep Sleep as Restoration Sleep for Survival DREAMS Content of Dreams Physiology of Dreams Dreams as Spiritual Communication Dreams as Wish-Fulfillment Dre

• School: University of Waterloo
• Department: Psychology
• Course: PSYCH101
• Professor: Richard Ennis

Document Summary

Sleep was restorative idea -> repair from wear and tear. Scientists too same view until 1950s: during certain periods of the night, people"s eyes started moving irradically (rem, rem didn"t fit restorative idea -> scientists changed their view. Sleep growth hormone released, as well as a hormone to synthesize protein and muscles. Physically-speaking, seems restorative: inside the brain, things are different. When going to sleep: breathing, metabolism, heart slow down, vision goes first, hearing shortly after, rapidly the others disconnect too. Hypnic jerk: whole body vibrates, occurs just as you"re going to sleep, accompanied by hypnogogic hallucinations. Sensation of falling/missing a step -> could wake you up. As you fall deeper and eeper into sleep, things change. Stage 1 very easy to wake you, brain wave activity changing. Stage 2 bursts of brainwave activity (muscle spasms) Stage 3/4 deep deep sleep, very hard to arouse someone, low frequency waves in brain activity, less than an hour to get into.