u4 aos1 dp7 & 8

Question 1

restoration theory

Answer 1

suggests we sleep in order to recover form depleting activities during the day which use up our physical and mental resources
- replenishes energy stores
- damaged cells repair
- muscles detoxify
- neurotransmitters replenish
supported by feeling refreshed and reenergised in the morning

Question 2

restorative functions of NREM

Answer 2

restore during stages 3 and 4
evidence
- marathon runners
- rats

Question 3

restorative fuctions of REM

Answer 3

evidence
- infants
- importance demonstrated through REM rebound

Question 4

REM rebound

Answer 4

person has lost sleep will spend more proportion of their sleep the next night in REM

Question 5

limitations of restoration theory

Answer 5

• no conclusive evidence of cause and effect relationship
• more active people dont sleep longer
• dont usually sleep ess when had a quiet day, suggest sleep mus be for more than just restoration

Question 6

evolutionary (circadian) theory

Answer 6

• sleep is a means of survival
• less likely to be seen as predators
• sleep beavuse we would face more danger at night (night vision)
• why circadian rhythm is 24 hours

Question 7

limitations of evolutionary theory

Answer 7

• must sleep despite danger or not
• not alert, therefore more danger

Question 8

across lifespan

Answer 8

• time sleeping decreases
• REM proportion decreases in forst 2 years then remains constant

Question 9

proportion of sleep

Answer 9

• infants - 16 hours (50% REM)
• 2 years - 12-13 hours (20-25% REM)
• 11 years - 9-11 hours (20-25% REM)
• adults - 8 hours (20% REM)
• elderly - 6-7 hours (15% REM)