CBN is what aging cannabis makes as THC breaks down, and the cannabinoid most often sold for sleep. That reputation is the honest problem: the one trial that measured sleep objectively did not find the effect. CBN is worth understanding precisely because so much is claimed for it and so little has been shown.
Where it stands legally
None. No FDA/EMA approval. CBN is an oxidative breakdown product of THC. It accumulates as cannabis ages, which is the historical root of its (unproven) "sleepy" reputation.
Where the evidence stands
Ranked by how much each finding can actually tell you, strongest first. A trial in people outranks a study in cells, including when the answer is no.
Human study
On its own, did not make people drowsy
Isolated CBN produced no drowsiness on its own and only slightly potentiated THC. The foundational human study, and it directly undercuts the "sedating" reputation. Karniol IG, Shirakawa I, Takahashi RN, et al. (1975). Pharmacology, 13:502–512. PubMed 1221432
Narrative review · not established
A proven sleep aid, "the sleep cannabinoid"
The only trial using objective sleep measurement (polysomnography) missed its primary endpoint (Lavender 2026, PMID 41698831). A larger nightly-dose trial also missed its primary sleep-quality endpoint and adding CBD did not help (Bonn-Miller 2024, PMID 37796540, manufacturer-funded). A dedicated review concluded there is insufficient published evidence to support a CBN sleep claim. Corroon J. (2021). Cannabis and Cannabinoid Research, 6:366–371. PubMed 34468204
Animal studies
Reduced muscle pain sensitivity in a rat model
Peripheral analgesia in a rat masticatory-muscle pain model, strongest combined with CBD. Rodent only. Wong H, Cairns BE. (2019). Archives of Oral Biology, 104:33–39. PubMed 31158702
Animal studies · not established
Relieves pain / reduces inflammation in people
CBN analgesia is from rodent studies; there are no human pain trials. Not a claim we make for people.
No published study · still open
It’s what makes aged cannabis sedating
Old cannabis has more CBN, but isolated CBN did not sedate people. The "indica couch-lock is CBN" story has never been demonstrated. Consumer products also typically dose ≤5 mg, far below the 20–100 mg used in the trials that showed even a weak signal.
Chemical identity, formula and molar mass: PubChem CID 2543, National Center for Biotechnology Information.
Terpenology is educational, not medical advice. Cannabinoid effects are tendencies reported by patients and early research, never guaranteed outcomes. Work with your certifying physician and pharmacist.