Diagnose Sleep Issue

---
name: diagnose-sleep-issue
description: Use when identifying the likely cause and type of a sleep problem to guide appropriate intervention or referral
source: American Academy of Sleep Medicine (AASM) ICSD-3 classification; CBT-I (Cognitive Behavioral Therapy for Insomnia) protocol — Morin & Espie; NIH consensus on sleep disorders
tags: [health, sleep, insomnia, sleep-disorder, cbt-i, diagnosis, sleep-diary]
verified: true
---

# Diagnose Sleep Issue

Systematically classify a sleep problem using evidence-based criteria to guide targeted intervention or referral.

## Why This Is Best Practice

**Adopted by:** American Academy of Sleep Medicine (AASM), sleep medicine specialists, CBT-I certified practitioners
**Impact:** AASM and NIH designate CBT-I as the first-line treatment for chronic insomnia (superior to medication); correct diagnosis is a prerequisite — the wrong intervention (e.g., sleep restriction for someone with sleep apnea) is ineffective and potentially harmful.

**Why best:** Misdiagnosing the type of sleep disorder leads to ineffective or counterproductive interventions. Insomnia, sleep apnea, restless leg syndrome, and circadian rhythm disorders have different causes and require different treatments; a structured diagnostic approach prevents wasted months on the wrong solution.

## Steps

1. **Collect a 2-week sleep diary** — Record nightly: bedtime, time lights out, estimated time to fall asleep (sleep onset latency), number and duration of nighttime awakenings, final wake time, time out of bed, subjective sleep quality (1–10), daytime fatigue (1–10), and naps; this is the primary data source.
2. **Screen for insomnia disorder** — ICSD-3 criteria: difficulty initiating or maintaining sleep at least 3 nights/week for at least 3 months, despite adequate opportunity, causing daytime impairment; if met, classify as chronic insomnia disorder.
3. **Screen for obstructive sleep apnea (OSA)** — Indicators: loud snoring, witnessed apneas, gasping/choking during sleep, excessive daytime sleepiness despite adequate time in bed, morning headaches, BMI > 30, neck circumference > 40cm; if 3+ indicators present, refer for polysomnography or home sleep apnea test.
4. **Screen for restless legs syndrome (RLS)** — IRLSSG criteria: urge to move legs accompanied by unpleasant sensations, worse at rest, worse in evening, temporarily relieved by movement; if present, refer to physician for evaluation (may require ferritin/dopamine assessment).
5. **Screen for circadian rhythm disorder** — Delayed sleep phase: naturally falls asleep after 2am and wakes after 10am; cannot sleep or wake at conventional times; Advanced sleep phase: involuntarily sleeps and wakes 2–4 hours earlier than desired; if suspected, confirm with actigraphy.
6. **Assess behavioral and environmental factors** — Evaluate: sleep hygiene (consistent schedule, bedroom environment), caffeine and alcohol use, screen exposure, exercise timing, medication side effects, stress and anxiety levels.
7. **Classify the primary diagnosis** — Determine the leading disorder driving the complaint; note comorbid conditions (anxiety, depression, and chronic pain are common insomnia comorbidities that require parallel treatment).
8. **Match diagnosis to intervention** — Chronic insomnia: CBT-I (first line), sleep restriction, stimulus control, cognitive restructuring; OSA: CPAP or oral appliance (physician-managed); RLS: physician referral; circadian disorder: chronotherapy and light therapy; behavioral issues: sleep hygiene protocol.

## Rules

- Never recommend sleep medication as a first-line intervention for chronic insomnia; CBT-I produces superior long-term outcomes with no dependency risk.
- Always rule out sleep apnea before implementing sleep restriction therapy; restricting sleep in an undiagnosed OSA patient worsens the condition.
- If the patient reports suicidal ideation or severe depression with the sleep complaint, prioritize mental health referral before sleep-specific treatment.
- Require at minimum 2 weeks of sleep diary data before drawing diagnostic conclusions; single-night reports are unreliable.
- Refer to a sleep medicine physician or CBT-I specialist for any suspected OSA, RLS, narcolepsy, or complex comorbid presentation.

## Examples

**Case:** 38-year-old female, difficulty falling asleep (60+ min), 3–4 awakenings/night, 5 nights/week for 8 months, daytime fatigue 7/10. Sleep diary confirms: SOL 55 min average, WASO 45 min, TST 5.5 hours. No snoring, no leg discomfort, goes to bed at 10pm but lies awake. No caffeine after noon. Diagnosis: Chronic insomnia disorder. Contributing factor: excessive time in bed creating low sleep drive. Intervention: CBT-I with sleep restriction (initial sleep window 12:30am–6:30am) and stimulus control.

## Common Mistakes

- **Diagnosing on self-report alone without a sleep diary** — Subjective perception of sleep is highly inaccurate; patients routinely underestimate sleep time and overestimate sleep latency.
- **Treating insomnia with hypnotics without addressing behavioral root causes** — Medication provides short-term relief but does not address conditioned arousal, perpetuating the disorder.
- **Missing sleep apnea in non-obese patients** — OSA occurs in normal-weight individuals, particularly with retrognathia (recessed jaw) or deviated septum; do not use BMI as the sole screening criterion.

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> **Health disclaimer:** This skill encodes evidence-based best practices for educational purposes. It is not medical advice. Consult a qualified healthcare professional before making health decisions.