Cards (2)

  • Research support for the sleep cycle
    • Shapiro - ultramarathon runners showed longer sleep after intense physical activity and increased proportion in deep sleep, suggesting it physically recovers body
    • Haider - EEG of 10 patients recovering from drug overdose showed more time spent in REM, suggesting it is for mental recovery
    • Therefore, this demonstrates evidence of stages of sleep
  • Individual differences
    • Significant variation between people
    • Tucker et al. - large differences between patients in terms of duration of each sleep stage, particularly 3 and 4
    • Concluded that these stages are likely to be biologically determined
    • Therefore, difficult to describe 'normal sleep' in any meaningful way