Sleep stages

Question 1

Light sleep
Transition to this stage be associated with hypnic jerks
Characterised by theta waves on EEG

Answer 1

Non-REM stage 1 (N1)

Question 2

Deeper sleep
Represents around 50% of total sleep
EEG shows Sleep spindles + K-complexes

Answer 2

Non-REM stage 2 (N2)

Question 3

Deep sleep
Parasomnias such as night terrors, nocturnal enuresis, sleepwalking
EEG shows Delta waves

Answer 3

Non-REM stage 3 (N3)

Question 4

Dreaming occurs
Loss of muscle tone, erections
EEG shows Beta-waves

Answer 4

REM