U4 AOS1 Dot Point 6

Question 1

circadian rhythms - sleep wake cycle

Answer 1

24 hour cycle
e.g sleep-wake cycle
influenced by environmental factors - sunlight
melatonin is released by the pineal gland to make us feel tired once it becomes dark

Question 2

ultradian rhythms - sleep cycle

Answer 2

less than 24 hour cycle
e.g sleep cycle
90 minute stages that repeat

Question 3

NREM sleep

Answer 3

4 stages
80% of sleep
more time at the start and decreases
physical restoration of the body

Question 4

stage 1 NREM

Answer 4

first fall asleep
hypnogogic state
hypnic jerk
reduced alpha replaced by theta
easy to wake

Question 5

stage 2 NREM

Answer 5

lengthens each cycle
EEG shows sleep spindles and K-complexes

Question 6

stage 3 NREM

Answer 6

beginning of deep sleep
later cycles have no stage 3
delta waves appear
harder to wake

Question 7

stage 4 NREM

Answer 7

deep sleep
delta waves
no stage 4 at the end
after first stage 4 it goes to REM not stage 1
sleepwalking
sleepwalking
nightterrors

Question 8

REM sleep

Answer 8

rapid eye movement
easily woken
vivid dreaming
beta waves
paradoxical sleep
period lengthen throughout the night
restoration of the brain