Clinical Insomnia Disorder: Initiate Cognitive Behavioral Therapy for Insomnia (CBT-I)
This patient meets diagnostic criteria for chronic insomnia disorder and should begin cognitive behavioral therapy for insomnia (CBT-I) immediately—no sleep testing is required for diagnosis or treatment initiation. 1
Diagnostic Reasoning
This 46-year-old woman clearly meets DSM-5 criteria for chronic insomnia disorder:
- Duration: 6 months (exceeds the 3-month threshold)
- Frequency: Most nights (exceeds 3 nights/week requirement)
- Sleep initiation difficulty: 60-minute sleep latency
- Daytime impairment: Unrefreshed awakening, irritability, concentration difficulties at work
- Adequate sleep opportunity: Conducive sleep environment, 7-hour sleep window 1
The diagnosis of chronic insomnia disorder is clinical and based entirely on history—it does not require objective sleep testing 1, 2.
Why Sleep Testing Is Not Indicated
None of the listed diagnostic tests are appropriate at this stage:
Polysomnography (option b) and HSAT (option d) are used to diagnose other sleep disorders like obstructive sleep apnea, not insomnia disorder. Guidelines explicitly state these objective measures are not part of routine insomnia diagnosis 2, 3
Multiple sleep latency test (option a) evaluates excessive daytime sleepiness and narcolepsy—irrelevant to this presentation
Insomnia Severity Index (option c) is a validated questionnaire that can quantify symptom severity and track treatment response, but it is a measurement tool, not a diagnostic test or treatment 2
First-Line Treatment Recommendation
The American College of Physicians issues a strong recommendation (Grade: strong recommendation, moderate-quality evidence) that all adult patients with chronic insomnia disorder receive CBT-I as initial treatment. 1
What CBT-I Includes:
- Behavioral interventions: Sleep restriction, stimulus control, relaxation training
- Cognitive therapy: Restructuring dysfunctional beliefs about sleep
- Sleep hygiene education 1, 2
Delivery Options:
CBT-I can be delivered through multiple modalities:
- In-person individual or group therapy
- Telephone-based programs
- Web-based/digital modules
- Self-help books 1
This flexibility makes CBT-I accessible even in settings without specialized sleep therapists.
Evidence Strength
The guideline recommendation is based on moderate-quality evidence showing CBT-I improves both global outcomes (measured by questionnaires like the Insomnia Severity Index) and specific sleep parameters (sleep-onset latency, wake after sleep onset, total sleep time, sleep efficiency) compared to inactive controls 2. CBT-I demonstrates efficacy across age groups, including middle-aged women like this patient 2.
When to Consider Pharmacotherapy
Medications should only be considered after CBT-I has been tried and proven insufficient, using shared decision-making that discusses benefits, harms, and costs of short-term medication use (Grade: weak recommendation, low-quality evidence) 1. This is a secondary, not initial, approach.
Common Pitfalls to Avoid
Do not order polysomnography or other sleep studies unless you suspect a comorbid sleep disorder (sleep apnea, restless legs syndrome, narcolepsy). This patient has no red flags suggesting these conditions 4
Do not start with pharmacotherapy—this violates evidence-based guidelines and exposes the patient to medication risks without trying the most effective long-term treatment first 1, 5
Do not delay treatment waiting for specialty referral or testing—primary care clinicians can initiate CBT-I or refer to digital CBT-I programs immediately 6
Answer: None of the listed options (a-d) represent the correct next step. The appropriate recommendation is to initiate CBT-I as first-line treatment. If forced to choose from the options provided, option (c) Insomnia Severity Index could be used as an adjunctive tool to quantify baseline severity before starting CBT-I, but it is not a treatment itself.