Sleep Disorders

Question 1

What do sleep studies include?

Answer 1

• Polysomnography (PSG)
• Multiple sleep latency test (MSLT)
• Actigraphy (relatively non-invasive method of monitoring human rest/activity cycles)

Question 2

What are the ways to measure sleep?

Answer 2

Electroencephalogram (EEG), Electrooculogram (EOG), Electromyogram (EMG)

Question 3

How does EEG measure sleep?

Answer 3

It measures the electrical changes in the brain. The electrodes are placed on the scalp.

Question 4

How does EOG measure sleep?

Answer 4

It measures the electrical changes as the eye rotates in its socket. The electrodes are placed either above and below the eye or left and right of the eye.

Question 5

How does EMG measure sleep?

Answer 5

It measures the electrical changes generated during muscle contraction. The electrodes are placed under the chin.

Question 6

How do EEG, EOG & EMG work together to measure sleep?

Answer 6

• They’re recorded simultaneously and the patterns of activity in these 3 systems provide basic classification for the different types of sleep.
• they all measure surface level electrical changes