Couch Lock
Slang for the heavy, sedating body effect some cannabis users experience, often mistakenly blamed on a single terpene.
Couch lock is a real subjective experience — that pinned-to-the-cushion heaviness after a strong dose — but the standard explanations for it are mostly folklore. It is not caused by "indica genetics," and there is no evidence that any specific myrcene threshold (like the widely repeated 0.5%) triggers it. The more boring truth: high THC doses, edibles, and individual sensitivity are the biggest drivers. Treat couch lock as a dose and tolerance phenomenon, not a chemotype signature.
Definition
Couch lock (noun) — a colloquial term for a heavy sedative and physically relaxing effect after consuming cannabis, characterized by reluctance or inability to get up and move. It is a subjective effect report, not a clinically defined syndrome.
What it feels like
Users describe deep muscle relaxation, limb heaviness, mental slowness, and a strong desire to stay seated or lie down. It typically appears at higher THC doses and is more common with edibles, where 11-hydroxy-THC contributes to longer, more sedating effects than smoked cannabis Strong evidence[1].
What probably causes it
The most parsimonious explanation is dose and route: higher THC exposure produces stronger sedation, motor slowing, and impaired psychomotor performance in controlled studies Strong evidence[2][3]. Individual factors — tolerance, metabolism, set and setting, coadministered CBD, and prior sleep debt — modulate how heavy the effect feels.
Common folk explanations are weaker than they sound:
- "Indica causes couch lock." The indica/sativa split does not reliably predict chemistry or effects; chemotype (cannabinoid and terpene profile) matters more, and even that predicts effects only loosely Disputed[4].
- "Myrcene above 0.5% causes couch lock." This specific threshold is repeated everywhere online but has no primary source and no controlled human data behind it No data. Myrcene has shown sedative effects in some rodent studies at high doses Weak / limited[5], but that does not establish a threshold in smoked or vaporized cannabis.
- "CBN causes couch lock." CBN is often marketed as the "sleepy cannabinoid," but a small controlled trial found no meaningful sedative effect at typical doses Weak / limited[6].
What it doesn't mean
Couch lock is not a medical diagnosis, not evidence of a specific strain lineage, and not proof of any particular terpene profile. It also isn't dangerous in the acute sense — but heavy sedation combined with driving, cooking, or caring for others is a real risk Strong evidence[3].
Used in articles
See also: Myrcene, Indica vs Sativa, 11-Hydroxy-THC, Edibles, CBN.
Sources
- Peer-reviewed Lemberger L, Crabtree RE, Rowe HM. 11-hydroxy-Δ9-tetrahydrocannabinol: pharmacology, disposition, and metabolism of a major metabolite of marihuana in man. Science. 1972;177(4043):62-64.
- Peer-reviewed Curran HV, Freeman TP, Mokrysz C, Lewis DA, Morgan CJ, Parsons LH. Keep off the grass? Cannabis, cognition and addiction. Nature Reviews Neuroscience. 2016;17(5):293-306.
- Peer-reviewed Ramaekers JG, Berghaus G, van Laar M, Drummer OH. Dose related risk of motor vehicle crashes after cannabis use. Drug and Alcohol Dependence. 2004;73(2):109-119.
- Peer-reviewed Smith CJ, Vergara D, Keegan B, Jikomes N. The phytochemical diversity of commercial Cannabis in the United States. PLoS ONE. 2022;17(5):e0267498.
- Peer-reviewed do Vale TG, Furtado EC, Santos JG, Viana GS. Central effects of citral, myrcene and limonene, constituents of essential oil chemotypes from Lippia alba. Phytomedicine. 2002;9(8):709-714.
- Peer-reviewed Karniol IG, Shirakawa I, Takahashi RN, Knobel E, Musty RE. Effects of Δ9-tetrahydrocannabinol and cannabinol in man. Pharmacology. 1975;13(6):502-512.
How this page was made
Generation history
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