CBT-I Sleep Physiology & Disorders 3

Question 1

Which of the following best describes 'sleep efficiency' as used in CBT-I assessment?

Accepted Answer

Total sleep time divided by total time in bed, expressed as a percentage

Answer

Sleep efficiency = (total sleep time ÷ time in bed) × 100, with 85% or above considered normal.

Question 2

Adenosine accumulation in the brain primarily promotes sleep by inhibiting which region?

Accepted Answer

Basal forebrain wake-promoting neurons

Answer

Adenosine inhibits wake-promoting neurons in the basal forebrain, thereby increasing sleepiness.

Question 3

A patient with narcolepsy type 1 would be expected to have low levels of which neuropeptide in cerebrospinal fluid?

Accepted Answer

Orexin (hypocretin)

Answer

Narcolepsy type 1 is caused by loss of orexin-producing neurons, resulting in very low or absent CSF orexin levels.

Question 4

Which polysomnographic finding is characteristic of REM sleep?

Accepted Answer

Low-voltage mixed-frequency EEG with REMs

Answer

REM sleep is characterized by a desynchronized, low-voltage mixed-frequency EEG pattern along with rapid eye movements and muscle atonia.

Question 5

In the two-process model of sleep regulation, Process C refers to:

Accepted Answer

The circadian rhythm of alertness

Answer

Process C is the circadian component that modulates alertness across the 24-hour day independent of prior sleep.

(CBT-I) CBT Insomnia Certification Practice Test