1. Sleep Studies of sleep deprivation Explanations of sleep
Restoration theory
Ecological theory
Implications of sleep deprivation studies for these theories

2. Sleep deprivation Rechtschaffen & Bergman (1995)
Increased appetite, metabolism imply body working harder
Immune function starts failing under prolonged deprivation
Suggests sleep necessary for normal biological functioning

3. Sleep deprivation Webb & Bonnett (1979a)
No obvious physiological effects following restricted sleep
Tendency to recover missed sleep the following night
‘Rebound’ suggests that sleep is a necessary function

4. Sleep deprivation Webb & Bonnet (1979b)
No apparent physiological effects following gradual reduction in sleep to 4hrs
Implies that some of our sleep is optional

5. Sleep deprivation Individual case studies
Wide variety of effects from mild to severe imply broad individual differences
Effects may be from sleep deprivation or possible pre-existing pathology
Difficult to generalise from single cases