Quick answer

CBN (cannabinol) and CBD (cannabidiol) appear together in many sleep products. No human clinical trial has tested the pair for insomnia. CBN's sedative reputation comes from animal studies, one small human study from 1975 that used THC, and a 2017 lab statement that was not peer reviewed. CBD has more studies, but results are mixed and tested doses run from 25 mg to 600 mg.

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What CBN is

CBN is a minor cannabinoid. It forms when THC oxidizes. Heat, light, and time convert THC into CBN, so aged flower and hash hold more CBN than fresh material. Most commercial CBN comes from hemp through controlled conversion, not from extraction of old plant.

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CBN binds CB1 receptors with low affinity. Estimates put its CB1 activity near one tenth of THC. It binds CB2 receptors with higher affinity. Animal work shows sedation at large doses, but mice and rats metabolize cannabinoids at rates that differ from humans.

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What the evidence shows

CBN alone

The main human data point is Karniol and colleagues, 1975. In that trial, CBN alone produced no measurable subjective effects. CBN plus THC increased THC effects, including drowsiness and rapid heart rate. No follow up human trial of CBN and sleep has been published. A 2017 claim from Steep Hill Labs that 5 mg of CBN equals 10 mg of diazepam spread through trade press. It cited no trial.

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CBD alone

Results split by dose and population. Carlini and Cunha, 1981, gave 300 mg CBD to 15 subjects with insomnia and reported longer sleep. Shannon et al., 2019, a retrospective case series of 72 patients with anxiety and poor sleep, used 25 to 175 mg per day and reported better sleep scores. A 2019 review in Current Psychiatry Reports found evidence for cannabinoids in sleep limited. THC cut sleep latency but disrupted REM and slow wave sleep.

The combination

Human data on CBD plus CBN does not exist. Ratios in commercial products run from 1:1 to 20:1 CBD to CBN. Label accuracy is a problem. A 2020 analysis of 25 CBD products found 20 held less CBD than stated. CBN labels have not been audited at scale.

Typical products and doses

Onset for oral products is 30 to 90 minutes. Inhaled CBN takes minutes. Edible effects can last 4 to 8 hours. People who use these products often report taking them 60 minutes before bed.

Risks and interactions

CBD inhibits CYP3A4, CYP2C19, and CYP2D6. That raises blood levels of some drugs, including clopidogrel, warfarin, and certain benzodiazepines. Adding CBN to sedatives, alcohol, or opioids raises the chance of heavy sedation. THC in sleep products can trigger anxiety, dry mouth, and next day grogginess in people who are sensitive.

Side effects reported for CBD: diarrhea, fatigue, appetite change, and liver enzyme elevation at high doses. The FDA has flagged liver injury at doses of 300 mg per day and above in Epidiolex trials.

Legal status in the US

CBN from hemp with 0.3 percent THC or less is legal under the 2018 Farm Bill at the federal level. State rules differ. Some states restrict CBN sales, and a few treat any cannabinoid beyond CBD as a controlled substance. The FDA has not approved CBN as a food or supplement ingredient. CBD is approved as Epidiolex for seizures, not for insomnia.

What to do

  1. Check the lab report on the product. Look for CBN, CBD, and THC content plus a batch number.
  2. Start low. 5 mg CBN plus 10 mg CBD is a common starting point.
  3. Log sleep onset, wake time, and grogginess for two weeks.
  4. Tell your doctor about all sedatives you take.
  5. See a clinician if insomnia lasts more than three weeks. CBT-I has stronger evidence than any cannabinoid.