Ch. 5 - States of Consciousness Flashcards
how long are each of the four sleep stages
90 minutes each
stage 1 sleep waves
relatively rapid, low amplitude brain waves
stage 1 sleep : what happens
transition between wakefulness and sleep, lasts only a few minutes. images sometimes appear
stage 2 sleep waves
slower, more regular wave pattern. momentary interruptions of sharply pointed, spiky waves what are called sleep spindles
stage 2 sleep characteristic
it becomes increasingly difficult to awaken a person from sleep as stage 2 progresses
stage 3 sleep waves
brain waves become slower, with higher peaks and lower valleys in the wave pattern
what happens in stage 3 sleep
people are least responsive to outside stimulation
when does stage 3 sleep occur
most likely to occur during the early part of the night (first half is dominated by stage 3 sleep)
when do stages 1 and 2 occur the mosty
second half of sleep
when do dreams occur
REM sleep (second half)
what happens during REM sleep
quick, back and forth eye movements
what % of adults sleeping time is REM
20%
what increases during REM
heart rate, blood pressure, and breathing
do ppl dream every night
yes -even if you don’t remember it
rebound effect
REM-deprived sleepers spend significantly ,ore time in REM sleep than they normally would when they can sleep undisturbed
reverse learning
during REM, our brain eliminates unneccesary info
