1. SLEEP WALKING

2. What is sleep walking?
The diathesis stress model suggests that there is a genetic predisposition that leads to sleep walking.
It occurs in SWS (stage 3 & 4) and they are in a state between sleep and wakefulness. An EEG would show delta waves and high frequency beta waves.
Environmental factors make sleep walking more likely to occur in those with the predisposition e.g sleep deprivation, alcohol, fever, being a child

3. IDA – Reductionism
Diathesis-Stress model recognises sleep walking occurs from a mixture of nature – the genetic predisposition and nurture – environmental factors such as alcohol/fever.
This means it is less reductionist than a purely genetic explanation as it focuses on a number of factors that together cause a person to sleep walk.
This has important implications for the way we treat people: can help those with a genetic predisposition manage the impact of their biology e.g avoiding drinking too much.

4. Looked at sleep walking with sleep deprivation
BASSETTI
Looked at bio evidence (HLA DQB1*05 gene)
Volunteer sample 74 (only genetically tested 16)
8 patients had gene
Gene present in 25% non- sleep walking population
OBJECTIVE
Blood tests replicable, empirical and consistent =reliable
SUPPORTING EVIDENCE
SMALL SAMPLE SIZE may not be representative/generalisable
VOLUNTEER SAMPLE may not be valid as many sleep walkers don’t even know they do it
ZADRA ET AL
Looked at sleep walking with sleep deprivation
40 Ps in lab study over 3 nights
‘normal sleep’ total of 32 sleep walking episodes
Ps kept awake for 25hrs
‘recovery sleep’ measured 40 ps had total 92 sleep walking episodes
Findings were not found in those who don’t sleep walk so it’s not enough tot just have sleep deprivation, they must also have a genetic disorder
(BASSETTI)
Sleep walking common in those with RLS (restless leg syndrome) which is a risk factor of insomnia, THEREFORE excessive tiredness
SMALL SAMPLE
Lowered eco validity as not in their own bed, could have allowed them to sleep in the beds for a few more nights before the study began

5. Wider Evaluation
The theory could be considered less determinist because of the diathesis-stress model, which suggests despite a genetic predisposition, environmental factors are needed to cause the disorder.
However, there is still an element of a lack of free will – environmental factors such as age and having a fever cannot be controlled.
It is also important to consider that in most cases sleepwalking is not severe – is there actually any major concern with having the disorder?

6. QUIZ TIME!!!!