The stages of sleep

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How many stages of sleep are there?
there are 5 stages of sleep
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What three things happen in stage 1?
your heart beat slows, muscle tension is reduced and alpha waves are reduced and replaced with slower de-synchronised waves.
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What two things happen in stage 2?
your EEG pattern becomes synchronised and larger slower waves are interupted by sleep spindles.
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What three things happen in stage 3?
larger slower waves dominate your EEG pattern, sleep spindles become less common and your heart rate and temp continue to fall.
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What three things happen in stage 4?
you have purely data waves in your EEG pattern, your metabolic rate reaches its lowest and your arousal threshold is very high = you are difficult to wake up.
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What two things happen in stage 5?
your muscles are completely relaxed and you remain hard to wake up.
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what is stage 5 sleep also known as?
REM sleep
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What is stage 5/REM also refferred to as?
paradoxial sleep
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What is an IDA point for this explanation?
biologically determinist
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why is it biologically determinist? (IDA)
it states that everyone will experience the same stages at certain ages however the duration of each stage varies from person to person depending on your biological needs.
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Name two pieces of research
Oswald and Horne
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What did Oswald find?
he found that REM sleep allows the restoration and reorganisation of the nervous system,NREM sleep involved the restoration and repair of the body through the release of growth hormones.
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How does the research by Oswald relate to the stages of sleep?
the body is hard to wake up in REM sleep due to the amount of energy being used to restore the nervous system which is key to normal brain functioning.
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What did Horne find?
stated that sleep was to aid psychological recovery, core sleep is stage 4 and 5 optional sleep is 1 -3. core sleep is critical for normal brain functioning.
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How does the research by Horne relate to the stage of sleep?
it follows the idea as it shows why we are harder to wake up during stage 4 and 5 as we need them. whereas stage 1-3 are relatively easy to wake from as we do not necessarily NEED this sleep to function normally
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What is a wider evaluation point?
Ethical issues
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What are the ethical issues? (wider evaluation)
to study the explanation in depth you would need to deprive ppts of specific stages, this could lead to negative health implications and their cognitive ability.
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What is it impossible to do regarding the stage of sleep? (wider evaluation)
isolate the later stages of sleep
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Card 2

Front

What three things happen in stage 1?

Back

your heart beat slows, muscle tension is reduced and alpha waves are reduced and replaced with slower de-synchronised waves.

Card 3

Front

What two things happen in stage 2?

Back

Preview of the front of card 3

Card 4

Front

What three things happen in stage 3?

Back

Preview of the front of card 4

Card 5

Front

What three things happen in stage 4?

Back

Preview of the front of card 5
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