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general adaptation syndrome (GAS)

general adaptation syndrome stages

alarm reaction, resistance, exhaustion


5 stages

beta waves

alert, fully awake state

alpha waves

awake, rested, relaxed state

theta waves

deep relaxation, light sleep

delta waves

deep sleep

NREM sleep

stages 1-4

stage 1

alpha waves replaced by theta waves

stage 2

theta waves, interrupted by sleep spindles and K complexes

sleep spindles

rapid, rhythmic brain wave activity

K complexes

large negative wave followed by a smaller positive one

stage 3

large, slow delta waves

stage 4

"deep sleep"

stage 4

delta waves


most dreaming

REM sleep

physiological responses similar to awake

REM sleep

muscles in state of flaccid paralysis

REM sleep

paradoxical sleep

paradoxical sleep

called this because of combo of physiological activity and deep sleep

stage 3 and 4 sleep

decreases throughout night

REM sleep

increases throughout night

time of all 5 stages together

90-100 min

2-3 months

begin with REM sleep, gradually changes to NREM sleep

stage 4 sleep and REM sleep

decrease from childhood to adulthood

newborn's REM

50% of total sleep time

6 month REM

30% of total sleep time

adult's REM

20% of total sleep time

stage 4

sleep terrors and sleepwalking occur

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