Does insomnia therapy fix how people think about their thinking?
Group CBT for insomnia improved sleep and sleep beliefs for everyone, but most patients still had problematic beliefs about their own thinking afterwards.
Source
"Thinking About Thinking" in Insomnia Disorder: The Effect of Cognitive-Behavioral Therapy for Insomnia on Sleep-Related Metacognition
Study at a glance
- Design
- Cohort — Uncontrolled pre/post evaluation of seven-session group CBT-I in insomnia patients, plus a baseline comparison with healthy controls.
- N
- N=27 · 27 insomnia patients completed CBT-I and were assessed before and after; 23 healthy controls were measured once for the baseline comparison.
- Population
- Adults diagnosed with insomnia disorder at a sleep centre in Milan, Italy, plus healthy good sleepers.
- Outcome
- Sleep-related metacognition (MCQ-I), dysfunctional sleep beliefs (DBAS-16), insomnia severity (ISI) and sleep-diary measures.
Structured fields used in claim comparison tables when every cited study has a complete layer.
What they did
Insomnia patients took part in seven 90-minute group sessions of cognitive-behavioural therapy for insomnia (CBT-I), covering sleep education, relaxation, stimulus control, sleep restriction and challenging unhelpful sleep beliefs. Before and after treatment they completed questionnaires on insomnia severity, beliefs about sleep (seen as 'primary arousal') and metacognitive beliefs about their own sleep-related thinking (seen as 'secondary arousal'), and kept sleep diaries. A group of healthy sleepers completed the same questionnaires once for comparison.
What they found
Patients scored higher than controls on both belief measures, and both measures correlated with insomnia severity across the whole sample. After CBT-I, insomnia severity and sleep beliefs improved strongly and metacognition improved modestly on average, but 63% of patients were still above the clinical cut-off for metacognitive problems and 29.6% had equal or worse metacognition scores. Patients who stayed above the cut-off still improved on insomnia symptoms and sleep beliefs, but not on metacognition.
The limits
What it doesn't show
There was no untreated or waitlist control group, so improvements cannot be attributed to CBT-I rather than time, regression to the mean or expectation. The sample was small and from one clinic, and patients were older than controls. There was no follow-up, so the authors' idea that leftover metacognitive problems predict relapse is a hypothesis, not a finding. All outcomes were self-report.
Key terms
- Metacognition
- Thinking about one's own thinking, including beliefs about whether processes such as worrying are useful or controllable.
- CBT-I
- Cognitive-behavioural therapy for insomnia, a multi-part treatment combining sleep restriction, stimulus control, sleep education and cognitive restructuring.
- Primary arousal
- Sleep-related thoughts and beliefs that directly interfere with falling asleep, such as 'I need eight hours to function'.
- Secondary arousal
- How a person reacts to those sleep thoughts, for example by ruminating or treating worry as useful, which amplifies arousal.
- Hyperarousal model
- The view that insomnia is kept going by raised physiological and cognitive activation that blocks the drive to sleep.
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Quiz yourself
In this study, what did the DBAS-16 questionnaire represent?
Common questions
If metacognition didn't improve for many patients, did CBT-I fail for them?
No. Those patients still improved on insomnia severity and sleep beliefs; the concern is that leftover metacognitive problems might make relapse more likely later, which this study did not test.
Why do the authors think CBT-I misses metacognition?
Its cognitive component targets the content of sleep beliefs, not beliefs about the thinking process itself such as the usefulness of worry, so it may leave secondary arousal untouched.
What would a stronger study look like?
A randomised design with a control group, a larger sample and long-term follow-up measuring whether residual metacognitive problems predict relapse.
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