Cannabis and Cannabinoids for Sleep: Evidence Review
What reviews and trials show for cannabis, CBD, THC and CBN in insomnia and sleep, with evidence levels, side effects, withdrawal insomnia and why sleep labels are not proof.
Content last updated . This page has not been medically reviewed.
How to read this page
This page summarizes research. It does not recommend cannabis, CBD, THC or CBN for sleep and gives no amounts for personal use. Evidence labels used: promising but limited, mixed, insufficient evidence, marketing claim and evidence of harm. A "systematic review" pools all trials found on a question. "Certainty" describes how much confidence the reviewers have in a result. If sleep trouble lasts or affects daily life, see a clinician; our sleep guide and insomnia guide explain other routes.The short answer
| Question | What the research found | Label |
|---|---|---|
| Medical cannabis for adults with insomnia | May have little to no clinically meaningful effect on sleep quality; very low certainty [1] | insufficient evidence |
| Cannabinoids and sleep quality across all trials | Improvement overall, but results disagree widely; CBD-only products showed no significant effect [2] | mixed |
| CBD alone | Research supporting it for insomnia is inadequate [3] | insufficient evidence |
| CBN (cannabinol) | No trials with validated sleep measures found in an older review; newer small trials are mixed [4][5] | insufficient evidence |
| Sleep claims on products | Not independent evidence | marketing claim |
Insomnia: the newest large reviews
A 2026 Cochrane review included nine trials with 537 adults. Compared with placebo, medical cannabis may have little to no clinically meaningful effect on sleep quality, total sleep time or daytime functioning, and may slightly increase adverse events. The certainty was very low to low. [1]A 2025 meta-analysis of six trials (1,077 people) reached a different result: cannabinoids improved sleep quality versus placebo, but the studies disagreed strongly (heterogeneity 88%), and CBD-only therapies showed no significant effect. [2] It included people with or without insomnia, unlike the Cochrane review's focus on adults with insomnia. [2][1]
A 2026 Lancet Psychiatry review of trials in mental disorders found that any cannabinoid type increased sleep time among people with insomnia, but the quality of that evidence was generally low. [6]
Earlier reviews were cautious. A 2020 review judged all five insomnia studies it found to be poor quality. [7] A 2024 update of 21 recent studies said the evidence base does not match the widespread use of cannabinoids for sleep disorders. [8]
CBD
A 2023 review concluded that research supporting CBD for insomnia is inadequate. [3] In a small 2024 randomized pilot trial of 30 adults with insomnia, insomnia severity, time to fall asleep and time awake after sleep onset did not differ from placebo, though sleep efficiency measured by wrist device was higher after two weeks. [9] That is a mixed, small result, not proof either way.THC
A 2026 JAMA review states that trial evidence does not support cannabis or cannabinoids for insomnia and reports that high-potency cannabis use is associated with more psychotic symptoms and generalized anxiety disorder than low-potency use. [10] The NCCIH notes that in people with other illnesses, better sleep may come from improvement in the illness itself, and that effects in people without other illnesses are uncertain. [11]CBN
CBN (cannabinol) is a cannabis constituent derived from delta-9-THC. [12] A 2021 review screened 99 human studies, reviewed eight, and found no trials using validated sleep questionnaires or sleep-lab measurement. It concluded the published evidence is insufficient to support sleep claims. [4] A later 2024 randomized study of 293 adults with poor sleep found CBN alone did not significantly change the main sleep-quality measure, though nighttime awakenings and overall sleep disturbance were lower than with placebo. Sleep-onset time and time awake did not differ. [5] A 2026 review notes a sleep-lab CBN trial missed its main endpoint. [13] See CBN.Risks to weigh
- Sedation. The FDA says CBD with alcohol or other drugs that slow brain activity, including those used for anxiety or sleep disorders, increases sedation and drowsiness, which can lead to injuries. [14]
- Withdrawal. NIDA lists insomnia among cannabis withdrawal symptoms after heavy, long-term use is stopped. [15] See dependence and withdrawal.
- Other effects. The Cochrane review found a possible increase in adverse events. [1] The FDA also lists CBD liver injury and medicine interactions. [14]
- Product accuracy. In one US sample, 74% of CBD products deviated from their labeled CBD amount by at least 10%. [16]
Products sold for sleep are covered in cannabinoid products marketed for sleep. Non-cannabis options are in CBT for insomnia and sleep supplements and natural aids. Do not stop prescribed sleep medicines on your own. Laws differ by country and change; this is not legal advice.
Frequently asked questions
Does cannabis help with insomnia?
A 2026 Cochrane review found it may have little to no clinically meaningful effect on sleep quality, with very low certainty. [1]
Does CBD help you sleep?
Research supporting CBD for insomnia is described as inadequate by a 2023 review. [3] A 2025 meta-analysis found no significant effect for CBD-only treatments. [2]
Does CBN help you sleep?
A 2021 review found no trials with validated sleep measures and called the evidence insufficient. [4] Later studies are small and mixed. [5]
Can stopping cannabis cause sleep problems?
Yes. NIDA lists insomnia among cannabis withdrawal symptoms. [15]
Is it safe to combine CBD with sleep medicines or alcohol?
The FDA warns this increases sedation and drowsiness and can lead to injuries. [14] Ask a prescriber or pharmacist.
References
- Varela LB et al. Medical cannabis for the treatment of insomnia. Cochrane Database of Systematic Reviews 2026. PubMed. Read 2026-10-22.
- da Silva GHS et al. 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. Sleep Medicine Reviews 2025. PubMed. Read 2026-10-22.
- Use of Cannabidiol in the Management of Insomnia: A Systematic Review. Cannabis and Cannabinoid Research 2023. PubMed. Read 2026-10-22.
- Corroon J Cannabinol and Sleep: Separating Fact from Fiction. Cannabis and Cannabinoid Research 2021. PubMed. Read 2026-10-22.
- Bonn-Miller MO et al. A double-blind, randomized, placebo-controlled study of the safety and effects of CBN with and without CBD on sleep quality. Experimental and Clinical Psychopharmacology 2024. PubMed. Read 2026-10-22.
- Wilson J et al. The efficacy and safety of cannabinoids for the treatment of mental disorders and substance use disorders: a systematic review and meta-analysis. The Lancet Psychiatry 2026. PubMed. Read 2026-10-22.
- Cannabinoids in the Treatment of Insomnia Disorder: A Systematic Review and Meta-Analysis. CNS Drugs 2020. PubMed. Read 2026-10-22.
- Lavender I et al. Using Cannabis and CBD to Sleep: An Updated Review. Current Psychiatry Reports 2024. PubMed. Read 2026-10-22.
- Narayan AJ et al. Cannabidiol for moderate-severe insomnia: a randomized controlled pilot trial. Journal of Clinical Sleep Medicine 2024. PubMed. Read 2026-10-22.
- Hsu M et al. Therapeutic Use of Cannabis and Cannabinoids: A Review. JAMA 2026. PubMed. Read 2026-10-22.
- National Center for Complementary and Integrative Health, Cannabis (Marijuana) and Cannabinoids: What You Need To Know (the research it summarizes dates mostly from 2019 and earlier, so newer trials are not covered). Read 2026-10-22.
- Lavender I et al. Cannabinol (CBN) effects on sleep and next-day function in insomnia disorder ('CUPID' study): protocol for a randomised, double-blind, placebo-controlled, cross-over, three-arm, proof-of-concept trial. BMJ Open 2023. PubMed. Read 2026-10-22.
- Metello Neves LB et al. Cannabinoids and sleep bruxism: mechanistic rationale, polysomnographic evidence, and future research directions. Sleep and Breathing 2026. PubMed. Read 2026-10-22.
- U.S. Food and Drug Administration, What You Need to Know (And What We’re Working to Find Out) About Products Containing Cannabis or Cannabis-derived Compounds, Including CBD (consumer update, content current as of 5 March 2020). Read 2026-10-22.
- National Institute on Drug Abuse, Cannabis (Marijuana) (page dated September 2024). Read 2026-10-22.
- Product labeling accuracy and contamination analysis of commercially available cannabidiol product samples. Frontiers in Pharmacology 2024. PubMed. Read 2026-10-22.