Biological rhythms

• Frequency and example of a circadian rhythm

  Once a day - every 24 hours

  Sleep/wake cycle
• frequency and example of an infradian rhythm

  Less than once a day

  The menstrual cycle
• Frequency and example of an ultradian rhythm

  More than once a day

  The stages of sleep
• How many stages of sleep is there per cycle

  5
• How long does each cycle last

  90 minutes in total
• how many times does it occur per night

  Continuously multiple times
• What is REM sleep and what happens to it

  When we dream

  It gets longer each cycle
• describe the stages

  1-2=light sleep and can be easily awoken

  3-5=deep sleep and hard to be awoken

  5=REM sleep and the body is paralysed whilst brain activity speeds up
• Which waves are involved with each stage

  1-2=alpha

  2-3=delta
• Strengths

  -evidence to support

  -practical application