Kymata Health CBD Guide
CBN (Cannabinol)
Formed as THC ages and marketed for sleep. One 2024 trial saw fewer night awakenings at 20 mg; a 2026 insomnia trial found no change in its main outcome but some secondary sleep improvements at 300 mg.
Level of human evidence: Small RCTs. Numbers in brackets link to the sources at the end of the page.
What it is
CBN forms when THC oxidizes over time. Products for sleep often pair it with CBD or melatonin.
How it works
CBN is a weak partial agonist at CB1 receptors, much weaker than THC. Whether it is mildly intoxicating at high doses is not well studied.
Human studies
In a 7-night randomized trial of adults with poor sleep (293 analyzed), 20 mg CBN reduced night awakenings and overall sleep disturbance versus placebo; the main sleep-quality result was not statistically significant, and adding CBD did not help further.[1]
In 20 adults with diagnosed insomnia, single 30 mg and 300 mg doses did not change the primary outcome (time awake after falling asleep). The 300 mg dose shortened time to fall asleep and improved self-rated sleep quality.[2][3]
Doses used in studies
Studied doses: 20 mg nightly for 7 nights; 30 mg and 300 mg single doses. Many products contain 5–50 mg per serving.[1][2]
Drug interactions
Not well studied. Do not combine with alcohol, sedatives or sleep medicines without medical advice.
Safety
Mild to moderate adverse events were common across all arms of the 2026 insomnia trial, including placebo. Long-term safety is unknown.[2]
Legal status
Because CBN can have THC-like effects, it may fall under the "similar effects" language of the new hemp definition once the Department of Health and Human Services decides which cannabinoids count.[4]
From December 11, 2026, federal law counts a finished hemp product as hemp only if the whole container holds no more than 0.4 mg of total THC (including THCA and THC-like cannabinoids). Full-spectrum products usually hold far more than that per bottle, so THC-free (isolate or verified broad-spectrum) products are the safe choice. State rules differ and can be stricter.[4]
Other cannabinoids
Compare brands on lab data: best CBD oils, ranked.
Sources
- Bonn-Miller MO et al. Double-blind RCT of the safety and effects of CBN with and without CBD on sleep quality. Exp Clin Psychopharmacol 2024
- Lavender IG et al. Cannabinol for acute insomnia disorder: randomized placebo-controlled crossover trial. J Sleep Res 2026
- ClinicalTrials.gov NCT05344170: Cannabinol use in patients with insomnia disorder
- Congressional Research Service: Changes to the statutory definition of hemp (IF13136)