Ultradian

• Ultradian rhythms?


  last less than 24 hours and can be found in pattern of human sleep. this includes REM and deep sleep.
• NREM stages?


  stage 1 & 2: light sleep stages- brainwaves slower and more rhythmic. stages 3&4: deep sleep or slow wave sleep difficult to wake up. Stage 5: body is paralysed and brain activity resembles that of an awake person.
• Tucker et al?


  Found significant difference between participants in terms of duration of each stage. this demonstrates that innate individual differences in ultradian rhythms.
• Tucker et al?


  carried out in a lab setting- differences instage could be due to situational difference. lack of ecological validity.
• Randy garderer?


  remained awaked for 264 hrs, after he slept for only 15 hrs and only recovered 25% of lost sleep. he recovered 70% of stage 4 and 25% of lost sleep.