AO3 - Ultradian Rhythms

• • Found that REM activity occured on average every 92 minutes.
  • Also found that this was when they were more likely to be having vivid dreams.
  • Supports the timings of the sleep stage cycle.
  • Suggests an endogenously controlled cycle.


  Dement and Kleitman (1957)
• • Found that although alcohol aids sleep, it leads to a more fragmented cycle during the sleep stages.
  • In particular, alcohol has been shown to lessen the ammount of time spent in REM sleep.
  • Suggests the ultradian rhythm of the sleep stages can be changed by a great deal by external factors that are allowed to consume and influence our EPs.


  Ebrahim et al (2013)