Chapter 8: States of Consciousness and Sleep

Question 1

(Rathus, 1990) How much of our lives are spent sleeping?

Answer 1

Approx. one-third

Question 2

Theories: WHY sleep?

Answer 2

1) Rest brain
... but brain VERY active during sleep
2) Rejuvenate tired body
... but sometimes wake up MORE tired
3) Stress relief
... but sometimes stress causes a lack of sleep

Question 3

Five Stages of Sleep

Answer 3

(four stages nonREM + REM)

1) brain waves: smaller, irregular; easily awakened; can faintly recall being awakened
2) brainwaves: increase; not awakened by slight sounds
3) Breathing and heart rate slow; body temperature drops; more difficult to wake up
4) (when “sleepwalkers” active); need shaking or loud noises to wake up
5) REM