Does CBN (cannabinol) actually cause sedation? What does the evidence show?

CBN is widely marketed as a sleep aid, but the evidence for sedation is remarkably thin. CBN is a THC degradation product formed by oxidation — aged cannabis has higher CBN content. The sedation claim originates largely from a 1975 study (Karniol et al.) that found CBN enhanced THC-induced sedation — but this was CBN combined with THC, not CBN alone. A 2021 Steep Hill Labs study (unpublished, industry-funded) claimed CBN was sedating, but this has not been replicated in peer-reviewed research. CBN's receptor pharmacology: weak partial CB1 agonist (10x less potent than THC), CB2 agonist, TRPV2 agonist. None of these mechanisms strongly predict sedation. A 2023 review in Sleep Medicine Reviews concluded there is insufficient evidence to support CBN as a sleep aid. The sedation effect in aged cannabis may be due to terpene degradation products, not CBN itself. This is a case where marketing has substantially outpaced science.