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CBD for Insomnia

Verdict: Dedicated CBD insomnia trials failed

Pure CBD has not been shown to improve insomnia. The two purpose-built primary-insomnia trials found no benefit, and the best meta-analysis shows that what little positive sleep signal exists comes from THC- or CBN-containing cannabis products, not CBD alone.

D 🔴 D Counter-Evidence Counter-Evidence

🔬Why this grade7-layer evidence engine

The strongest condition-specific evidence is negative. Two randomized pilot trials of 150 mg nightly pure CBD in adults with moderate-to-severe primary insomnia (PMID 38174873; companion PMID 39153080) found no between-group benefit on insomnia severity, sleep-onset latency, sleep efficiency, or wake after sleep onset. A 2025 meta-analysis of 6 RCTs in 1,077 people (PMID 40929927) is decisive: any improvement in subjective sleep was driven by THC- and/or CBN-containing products, while CBD-only therapies showed no statistically significant effect.

What remains is weak, confounded, or pointing the wrong way. A CBD-plus-terpene formulation (PMID 39167421) raised slow-wave-plus-REM sleep by only 1.3% with no gain in total sleep time and heavy dropout, and it was not pure CBD. A single THC+CBD dose (PMID 40631525) actually worsened objective sleep, cutting total sleep time and REM. A Mayo Clinic systematic review (PMID 36149724) found only 2 of 34 studies were insomnia-specific and called the evidence inadequate.

Authorities reinforce the downgrade. Mayo Clinic states research supporting CBD for insomnia is inadequate, and sleep-medicine guidance discourages routine cannabinoid use, favoring CBT-I. Regulators add caution and risk: the US FDA says existing food and supplement frameworks are not appropriate for CBD, and the UK FSA advises healthy adults limit intake to 10 mg/day and excludes vulnerable groups. Combined with drug-interaction and liver-safety concerns and predominantly industry funding, this earns a Counter-Evidence grade for an unproven indication.

⚖️

Scoring transparency

All scores computed by a 7-layer evidence engine — fully auditable
Raw score 0.39
D
C
B
A
S
← counter-evidence / ineffectiveeffective / strong evidence →
Final grade
D · Counter-Evidence
Confidence
75%
Broadly consistent
Evidence level
E2
Multiple high-quality MAs (≥2 independent, consistent)

How strongly each layer supports this effect

lower = less supportive
L11 AI re-checkIndependent read
0.30
L5 Clinical bodiesAuthoritative stance
0.32
L2 PubMedPrimary literature
0.45
L3 MechanismPlausibility
0.45
L1 ExamineGlobal benchmark
0.50
Against Mixed Supports
▸View the full decision path (audit trail)
  1. compute_raw_score — 加權公式: L2×0.30 + L3×0.25 + L5×0.25 + L11×0.10 + L1×0.10 = 0.386
  2. tier_from_score — 依分數區間映射至 tier letter
  3. apply_hec_rules — 高階證據未達主導 (1 positive vs 1 negative)，由 raw_score 決定
  4. tier_strict_requirement_check — Tier 條件達標，未降階
  5. detect_disputes — 偵測到 0 個 hard + 1 個 soft dispute
  6. decide_status — 依 tier + dispute 結果決定 status

📄PubMed studies (6)L2 · primary research & systematic reviews

Cannabidiol for moderate-severe insomnia: a randomized controlled pilot trial of 150 mg of nightly dosing
PMID: 38174873 2024 隨機對照試驗 n = 30
Finding: In adults with moderate-severe primary insomnia, 150 mg pure CBD showed NO between-group difference vs placebo on insomnia severity, self-reported sleep-onset latency, sleep efficiency or wake after sleep onset (all p>0.05). Objective sleep efficiency improved modestly after 2 weeks (mean difference +6.85%, p<0.05) and well-being scores were higher with CBD (mean difference 2.60, p<0.05), but the primary insomnia outcomes were null.
🟠 Limited quality ⚠️ Industry-funded Effect size: Primary insomnia outcomes NS; objective sleep efficiency +6.85% (p<0.05)
View on PubMed
The effect of nightly use of 150 mg cannabidiol on daytime neurocognitive performance in primary insomnia: a randomized controlled pilot trial
PMID: 39153080 2025 隨機對照試驗 n = 30
Finding: Companion analysis of the same 150 mg CBD primary-insomnia cohort: nightly CBD did NOT impair daytime cognition (all p>0.05) and was associated with greater self-reported calmness, clear-headedness and coordination, plus more dry mouth. The study supports daytime safety but does not demonstrate a sleep benefit for insomnia.
🟠 Limited quality ⚠️ Industry-funded Effect size: Cognition unaffected; mood/calmness improved (p<0.05); dry mouth more common
View on PubMed
Effects of a cannabidiol/terpene formulation on sleep in individuals with insomnia: a double-blind, placebo-controlled, randomized, crossover study
PMID: 39167421 2024 RCT (double-blind) n = 56
Finding: A CBD/terpene formulation produced only a marginal increase in slow-wave + REM sleep (+1.3%, 95% CI 0.1-2.5%, p=0.03) and did NOT increase total sleep time. 125 enrolled but only 56 completed (high attrition). This is a CBD-plus-terpene product, not pure CBD, and the effect is small and of uncertain clinical relevance.
🟠 Limited quality ⚠️ Industry-funded Effect size: SWS+REM +1.3% (p=0.03); total sleep time unchanged
View on PubMed
Acute Effects of Oral Cannabinoids on Sleep and High-Density EEG in Insomnia: A Pilot Randomised Controlled Trial
PMID: 40631525 2025 隨機對照試驗 n = 20
Finding: A single THC+CBD combination dose WORSENED objective sleep in insomnia patients: total sleep time fell by 24.5 min and REM sleep fell by 33.9 min vs placebo, with delayed REM onset. Authors attribute the effect mainly to THC. This is a THC-containing product, not pure CBD, and illustrates that the cannabis/THC sleep signal can be negative.
🟠 Limited quality Effect size: Total sleep time -24.5 min; REM -33.9 min (THC-driven)
View on PubMed
Use of Cannabidiol in the Management of Insomnia: A Systematic Review
PMID: 36149724 2023 系統性回顧
Finding: Mayo Clinic-authored systematic review of 34 studies. Among hypothesis-testing studies only 4 of 7 CBD-predominant arms showed significant insomnia improvement vs 12 of 16 near-equal CBD:THC arms. Critically, only 2 of 34 studies focused specifically on insomnia patients (one was a case report); most relied on non-validated subjective measures. Concludes CBD alone or with equal THC may help but rigorous insomnia-specific trials are needed.
Effect size: CBD-predominant: 4/7 arms significant; near-equal CBD:THC: 12/16 significant
View on PubMed
Effectiveness of cannabinoids on subjective sleep quality in people with and without insomnia or poor sleep: A systematic review and meta-analysis of randomised studies
PMID: 40929927 2025 統合分析 n = 1,077
Finding: Meta-analysis of 6 RCTs (1077 patients). Cannabinoids overall improved subjective sleep quality, but the effect was driven by THC- and/or CBN-containing products: CBD-ONLY therapies showed NO statistically significant effect on sleep quality. This directly distinguishes pure-CBD evidence (null) from cannabis/THC evidence.
Effect size: CBD-only: NS; THC/CBN-containing: significant improvement
View on PubMed

🏛️Regulatory & authoritative positionsL4/L5 · FDA / EMA / NIH ODS / Cochrane / Mayo …

L4a US FDA
Against
Today, the U.S. Food and Drug Administration announced that the agency has concluded that a new regulatory pathway for CBD is needed... the agency has concluded that existing regulatory frameworks for foods and supplements are not appropriate for CBD. source↗
L4b EU EFSA
Against
L4c UK NHS
Cautious
Healthy adults should think carefully before taking CBD, and should consider limiting their consumption of CBD from food to no more than 10mg per day, which is about 4-5 drops of 5% CBD oil. The FSA continues to advise that CBD is not taken by people in vulnerable groups, including children, people taking medication and those who are pregnant or breastfeeding and those trying to conceive. source↗
L4d TW TFDA / 衛福部
Against
大麻二酚(CBD)不屬於毒品及管制藥品，考量其具有非常多藥理活性及可能的醫療用途，我國以一般藥品列管。 source↗
L4e WHO
Not addressed
In general, CBD is well tolerated with a good safety profile... To date, there is no evidence of recreational use of CBD or any public health-related problems associated with the use of pure CBD. [WHO ECDD Cannabidiol (CBD) Critical Review Report, June 2018] source↗
L5a NIH Office of Dietary Supplements
Cautious
L5b Mayo Clinic
Cautious
CBD is often used by patients for the management of insomnia, yet research supporting CBD's effectiveness as a treatment for insomnia is inadequate. source↗
L5c Cleveland Clinic
Cautious
L5d Harvard Health
Cautious
L5e Specialty Society (condition-mapped)
Against
✓PMID 100% verifiedevery citation checked via NCBI Entrez
🔬6 PubMed studiesindependently re-checked by multiple sub-agents
engine_version: v1.0 claim_id: CLM-COND-insomnia-INT-cannabidiol-001 繁體中文版 →