CAS PS 101 Chapter Notes - Chapter 7: Circadian Rhythm, Sleep Deprivation, Non-Rapid Eye Movement Sleep

• School: Boston University
• Department: Psychological & Brain Sciences
• Course: CAS PS 101
• Professor: Martha Tompson

Document Summary

Light schedules a ect rhythm begin to feel less active serval hours after the onset of the dark part of our day-night cycle and most alert several hours after light onset. The science of sleep and dreaming: sleep: natural, periodically occurring state of rest characterized by reduced activity, lessened responsiveness to stimuli, and distinctive patterns of brain activity, stages of sleep: Characteristics of waking and sleep states: prior to sleep: Awake: low-amplitude and high-frequency waves called beta waves. Drowsy: higher-amplitude and slower frequency called alpha waves. Eeg tracing, 20 to 50 percent of which consists of delta waves and virtually no eye movement: stage 4: deepest level of sleep, characterized by an eeg tracing exceeding 50 percent delta waves and virtually no eye movements. In a night"s sleep, we move through successive cycles, drifting up and down between the various phases of rem and nrem sleep. Sleep grows progressively less deep throughout the sleep cycle.