CBN and Sleep: What the Research Shows

Overview

Cannabinol (CBN) has gained attention as a potential sleep aid, with many products marketed specifically for sleep support. However, the scientific evidence for CBN's effects on sleep is limited. This guide examines what CBN is, the current state of research, and what consumers should understand before using CBN products.

What is CBN?

CBN is a minor cannabinoid found in cannabis plants. Unlike CBD and THC, CBN is not produced directly by the plant's biosynthesis. Instead, CBN forms when THC degrades over time through exposure to oxygen, heat, and light [1].

Fresh cannabis contains minimal CBN. Aged cannabis or improperly stored products typically have higher CBN concentrations. This degradation process is why CBN was one of the first cannabinoids discovered—early researchers were often working with aged plant material.

CBN Characteristics

CBN is sometimes described as mildly psychoactive. Research suggests it binds to CB1 receptors with significantly lower affinity than THC—approximately one-quarter to one-tenth the potency [2].

The Sleep Claim: Where Did It Come From?

The association between CBN and sleep appears to originate from two sources:

1. Anecdotal Observations of Aged Cannabis

Cannabis users have long reported that older, degraded cannabis produces more sedating effects. Since aged cannabis contains higher levels of CBN, this observation led to the assumption that CBN causes sedation.

However, aged cannabis also contains different terpene profiles (due to degradation), oxidized forms of other cannabinoids, and changes in the overall chemical composition. Attributing sedation solely to CBN oversimplifies these effects [3].

2. A 1975 Study

A frequently cited 1975 study by Karniol and colleagues examined the effects of THC combined with CBN in five human subjects. The researchers reported that subjects who received THC plus CBN experienced more drowsiness than those who received THC alone [4].

Important limitations of this study:

• Only five subjects participated
• CBN was tested only in combination with THC, not alone
• The drowsiness may have resulted from an interaction between CBN and THC, not CBN alone
• The study used different doses and had methodological limitations by modern standards

No subsequent human studies have directly tested CBN's effects on sleep.

Current State of Research

What the Limited Evidence Shows

Research on CBN is sparse compared to THC and CBD. Here is what existing studies have found:

Preclinical (animal) studies:

• A 2019 study in rats found that CBN extended sleep time when administered with THC, but did not significantly affect sleep when given alone [5]
• Some rodent studies suggest CBN may have analgesic (pain-relieving) properties, which could indirectly affect comfort and sleep [6]

Human studies:

• No controlled human trials have specifically examined CBN's effects on sleep
• The only human data comes from the 1975 Karniol study mentioned above

Comparison to Other Sleep Research

For context, consider the research base for other cannabinoids:

Research on THC and sleep has produced mixed findings, with some studies suggesting it may help with sleep onset but potentially affect sleep quality and REM sleep [7]. CBD research for sleep has also shown inconsistent results, with effects potentially depending on dose and whether anxiety is contributing to sleep problems [8].

Why CBN Products Are Popular Despite Limited Evidence

Several factors contribute to CBN's popularity as a sleep product:

Marketing and Perception

CBN has been marketed as a "sleep cannabinoid" based on the anecdotal and limited research described above. Once this framing became established, it spread through the industry.

Consumer Experience

Some users do report improved sleep with CBN products. Several explanations are possible:

1. Placebo effect: Belief that a product will help with sleep can itself improve sleep
2. Other ingredients: Many CBN sleep products also contain melatonin, CBD, terpenes like myrcene and linalool, or other sleep-supporting compounds
3. Mild sedative properties: CBN may have some sedating effects, just not well-documented
4. Individual variation: Some individuals may respond to CBN differently than others

Regulatory Environment

The lack of FDA oversight for cannabinoid supplements allows products to make claims that would require clinical evidence in regulated contexts.

What About Terpenes?

Some researchers suggest that terpenes may play a significant role in the perceived sedating effects of certain cannabis products. Terpenes commonly associated with relaxation include:

• Myrcene: Found in hops, lemongrass, and cannabis; often described as sedating
• Linalool: Found in lavender; associated with calming effects
• Terpinolene: Found in lilacs and apples; reported as relaxing by some users

These compounds may contribute to the effects of CBN products, particularly those using full-spectrum extracts [9].

Considerations for Consumers

If You're Considering CBN Products

1. Understand the evidence is limited: Marketing claims about CBN for sleep are not well-supported by current research

1. Check product contents: Many CBN products include other ingredients (melatonin, other cannabinoids, terpenes) that may contribute to effects

1. Look for third-party testing: Verify the product contains the stated amount of CBN

1. Consider the source: CBN products are typically derived from hemp and may contain trace amounts of THC

1. Start with low doses: If trying CBN, begin with the lowest available dose

1. Don't replace proven treatments: If you have a sleep disorder, consult a healthcare provider rather than relying on supplements

Dosing

There is no established effective dose for CBN since no controlled human trials exist. Products typically contain 5-25 mg of CBN per serving. Without clinical research, optimal dosing remains unknown.

Drug Interactions

CBN, like other cannabinoids, may affect cytochrome P450 enzymes involved in drug metabolism. Consult a healthcare provider if taking other medications [10].

Drug Testing

CBN is a degradation product of THC. While CBN itself is not typically what drug tests screen for, products containing CBN may also contain THC or may cause metabolites that could trigger a positive test result.

What We Actually Know

To summarize the current evidence:

Supported by research:

• CBN forms when THC degrades
• CBN has low-to-moderate affinity for cannabinoid receptors
• CBN is mildly psychoactive at high doses

Not established by research:

• That CBN specifically promotes sleep in humans
• What dose of CBN would be effective for sleep
• Whether CBN alone (without other cannabinoids or compounds) affects sleep

Requires more research:

• Direct comparison of CBN to placebo for sleep outcomes
• CBN's mechanism of action related to sedation
• Long-term safety of CBN supplementation

Summary

CBN has been marketed as a sleep cannabinoid, but the evidence supporting this claim is extremely limited. The primary research cited is a single 1975 study with five subjects that tested CBN only in combination with THC. No controlled human trials have examined CBN's effects on sleep. While some users report positive experiences, these could be attributed to placebo effects, other ingredients in products, or individual variation. Consumers should understand the evidence limitations and not expect CBN to be a proven sleep solution.

References

1. Turner CE, Elsohly MA. Biological activity of cannabichromene, its homologs and isomers. J Clin Pharmacol. 1981;21(S1):283S-291S.

1. Mahadevan A, Siegel C, Martin BR, Abood ME, Beletskaya I, Bhattacharya S, et al. Novel cannabinol probes for CB1 and CB2 cannabinoid receptors. J Med Chem. 2000;43(20):3778-3785.

1. Russo EB. Taming THC: potential cannabis synergy and phytocannabinoid-terpenoid entourage effects. Br J Pharmacol. 2011;163(7):1344-1364.

1. Karniol IG, Shirakawa I, Takahashi RN, Knobel E, Musty RE. Effects of delta9-tetrahydrocannabinol and cannabinol in man. Pharmacology. 1975;13(6):502-512.

1. Corroon J. Cannabinol and Sleep: Separating Fact from Fiction. Cannabis Cannabinoid Res. 2021;6(5):366-371.

1. Wong H, Bhattacharyya S. Cannabinoid pharmacology and its potential therapeutic role in neurological disorders. Expert Rev Neurother. 2021;21(8):875-890.

1. Gates PJ, Albertella L, Copeland J. The effects of cannabinoid administration on sleep: a systematic review of human studies. Sleep Med Rev. 2014;18(6):477-487.

1. Shannon S, Lewis N, Lee H, Hughes S. Cannabidiol in Anxiety and Sleep: A Large Case Series. Perm J. 2019;23:18-041.

1. Sommano SR, Chittasupho C, Ruksiriwanich W, Jantrawut P. The Cannabis Terpenes. Molecules. 2020;25(24):5792.

1. Brown JD, Winterstein AG. Potential Adverse Drug Events and Drug-Drug Interactions with Medical and Consumer Cannabidiol (CBD) Use. J Clin Med. 2019;8(7):989.