A03

• What is one strength of research into ultradian rhythms?

  Improved understanding of age-related changes in sleep
• How does slow-wave sleep (SWS) change with age?

  SWS reduces with age
• Why is growth hormone production significant in relation to SWS?

  It is mostly produced during SWS
• What issues in old age may result from sleep deficits?

  Reduced alertness
• What methods can be used to increase SWS?

  Relaxation and medication
• What does the research on ultradian rhythms suggest about its practical value?

  It has practical value for improving sleep
• What is one limitation of ultradian rhythms research?

  Significant variation between people
• What did Adrienne Tucker et al. (2007) find about sleep stage duration?

  Large differences between participants
• What do Tucker et al. suggest about the differences in sleep stages?

  They are likely biologically determined
• Why is it difficult to describe 'normal sleep' according to ultradian rhythms research?

  Due to significant individual differences