CBT-I Sleep Restriction & Stimulus Control Therapy

Question 1

What is the primary mechanism by which sleep restriction therapy improves sleep in patients with chronic insomnia?

Accepted Answer

It builds homeostatic sleep pressure by restricting time in bed to match actual sleep time

Answer

It increases melatonin production by limiting artificial light exposure before bed

Answer

It trains the brain to fall asleep faster through classical conditioning of the sleep environment

Answer

It reduces cortisol levels by establishing a consistent, earlier bedtime

Question 2

In sleep restriction therapy, how is the initial time in bed (TIB) prescription typically determined?

Accepted Answer

It is set equal to the patient's average total sleep time derived from a 1-2 week sleep diary

Answer

It is set to exactly 6 hours for all patients regardless of baseline data

Answer

It is based on the patient's subjective report of how much sleep they feel they need

Answer

It is calculated by subtracting reported sleep latency from the patient's desired bedtime

Question 3

How is sleep efficiency (SE) correctly calculated in CBT-I protocols?

Accepted Answer

Total sleep time divided by time in bed, multiplied by 100

Answer

Total time in bed divided by total sleep time, multiplied by 100

Answer

Wake after sleep onset divided by total sleep time, multiplied by 100

Answer

REM sleep time divided by total sleep time, multiplied by 100

Question 4

What is the minimum time in bed (TIB) typically prescribed during sleep restriction therapy to protect patient safety?

Accepted Answer

5 hours

Answer

4 hours

Answer

6.5 hours

Answer

7 hours

Question 5

According to standard sleep restriction protocols, under what condition should a patient's TIB be increased?

Accepted Answer

When sleep efficiency exceeds 85% for approximately five of seven nights

Answer

When the patient reports feeling well-rested upon awakening on most mornings

Answer

After completing a fixed two-week period at the initial TIB prescription

Answer

When total sleep time increases by more than 45 minutes from the baseline diary

Question 6

What is the recommended increment for expanding TIB when sleep efficiency criteria are met in sleep restriction therapy?

Accepted Answer

15 to 30 minutes per week

Answer

60 to 90 minutes per week

Answer

5 to 10 minutes per night

Answer

1 full hour every two weeks

Question 7

A patient's sleep diary shows an average total sleep time of 5.5 hours and an average time in bed of 8 hours. What is their sleep efficiency?

Accepted Answer

69%

Answer

55%

Answer

75%

Answer

82%