Week 12 - Sleep and Sleep Disorders

Question 1

What are the several ways to measure sleep?

Answer 1

Objective:
- Polysomnography (PSG)
- Actigraphy

Subjective:
- Sleep diary
- Self-report questionnaireires

Question 2

How does Polysomnography measure sleep?

Answer 2

Brain waves - EEG
Eye movement - EOG
Muscle activity - EMG
Breathing and airflow
Heart rate and rhythm - ECG
O2 Saturation - SpO2

Question 3

What does EEG show?

Answer 3

Difference in electrical potential between pairs of electrodes placed on the scalp

Y-axis = voltage
X- axis = time

EEG traces show continuous fluctuation of electrical activity in the brain

Question 4

What are the types of waves that EEG shows?

Answer 4

Beta waves
Alpha waves
Theta waves
Delta waves

Question 5

What do sleep waves show in terms of its frequency?

Answer 5

faster = more alert/wake
slower = drowsier/deeper sleep

Question 6

What are the characteristics of each stage of sleep

Answer 6