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Consciousness and Sleep

Have you ever been "unconscious" because of an accident or anesthesia? What happened? What was it like?


A. Consciousness = awareness of internal & external stimuli

Other terms:

B. Brain Activity & Consciousness

[EEG Diagram][Types of
        Brain Waves]

brain's biological clock

Biological Rhythms & Sleep D. Sleep-Wake Cycle (This is a change in terminology & not in the book)
[Stages of Sleep - New version]

Stage W: Wakefulness, awake

Stage N1: Theta waves = light sleep

Stage N2: Sleep spindles & mixed EEG activity

Stage N3: Delta (slow) waves => deep sleep

REM ("Rapid Eye Movement") Sleep


This page was originally posted on 11/12/03 and last updated on November 15, 2016