Stages Of Sleep Flashcards
Usually lasts an average of 10 minutes
Stage 1 sleep
Called a light sleep or “half awake half asleep” stage
Stage 1 sleep
Person my show a hypnotic jerk- reflex muscle contraction throughout the body
Stage 1 sleep
EEG pattern- marked by presence of theta waves, which are lower in amplitude and frequency than alpha waves
Stage 1 sleep
Fairly easy to awaken person in this stage
Stage 1 sleep
People who are awakened from this stage report that they were awake
Stage 1 sleep
Considered the onset of true sleep
Stage 2 sleep
This stage averages 20 minutes
Stage 2 sleep
Someone awakened from this stage reports being asleep
Stage 2 sleep
EEG pattern- high frequency bursts of brain activity called sleep spindles
Stage 2 sleep
Near the end of this stage delta waves begin to show
Stage 2 sleep
The persons muscle tension, heart rate, respiration, and temperature begin to decline
Stage 2 sleep
Persons eyes move slowly side to side
Stage 2 sleep
Transition stage from wakefulness to sleep
Stage 1 sleep
The persons muscle tension, heart rate, restriction, and temperature continue to decline
Stage 3 sleep
EEG pattern- delta waves start to show more
Stage 3 sleep
These stages are sometimes called slow wave sleep
Stages 3 and 4
EEG pattern- high amplitude and very low frequency (delta waves)
Stage 4 sleep
Delta waves must be at least 50% of the EEG pattern, will eventually constitute 100% of pattern
Stage 4 sleep
Considered the deepest stage of sleep- most difficult to wake someone
Stage 4 sleep
Sleep walking and sleep talking occur in this stage
Stage 4 sleep
Children with night terrors have them in this stage
Stage 4 sleep
Most people who do get up at this time don’t remember the experience or getting up
Stage 4 sleep
Makes up approximately 20% of a persons sleep time
REM sleep
The persons eyes most rapidly back and forth
REM sleep
EEG pattern- fast frequency and low amplitude which looks just like beta waves (beta waves normally occur when a person is awake)
REM sleep
Often called paradoxical sleep
REM sleep
Heart rate and blood pressure have increases sometimes twice as high in this stage
REM sleep
Person loses muscle tension and movement
REM sleep
Most dreams reported during this stage
REM sleep
A person deprived of REM sleep one night will have more REM sleep the next night
REM rebound
