Theories of sleep Restoration Oswald Horne The function
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Theories of sleep • Restoration (Oswald; Horne) The function of sleep is to allow body to be repaired and restored • • Oswald (1980) – REM for brain; SWS for body Horne (1988) – core sleep (REM & SWS) vs. optional sleep psychlotron. org. uk •
Restoration theory Main predictions: • • Deficits in functioning during sleep deprivation Rebound following deprivation Increase in REM during brain growth, reorganisation & repair Increase in SWS during illness, recovery from injury psychlotron. org. uk •
Effects of sleep deprivation Animal studies tend to support restoration • • • Prolonged sleep deprivation causes immune failure & death Studies of humans produce less clear-cut results Confounding effects of stress etc. psychlotron. org. uk •
Rebound Generally, people catch up on sleep following deprivation • • • Not all lost sleep is reclaimed About 70% of lost SWS and about 50% of lost REM typically recovered Only some sleep is necessary psychlotron. org. uk •
• 5 yrs 24 hour period • REM NREM • Age Reduction in sleep over lifespan Highest in infants; highest REM in early years Some changes in adolescence psychlotron. org. uk Growth & reorganisation
Illness & injury Sleep does increase during illness and recovery from injury • • • Total sleep time increases during illness REM increases during recovery from brain injury, ECT & drug withdrawal SWS deprivation cause physical symptoms psychlotron. org. uk •
Evaluation • Much evidence is consistent with the restoration view Main problem comes from apparent lack of serious biological malfunction during sleep deprivation in humans psychlotron. org. uk •
