N-arachidonoyl-serotonin (AA-5-HT) increased sleep during the active period in rats, enhanced sleep recovery after deprivation, and blocked the wake-promoting effects of CBD and modafinil.
Read this if you are interested in how the endocannabinoid system controls sleep and why CBD might not always help with sleep.
AA-5-HT promoted sleep and blocked the wake-promoting effects of CBD
What the researchers found
This study demonstrated that AA-5-HT, a dual FAAH inhibitor and TRPV1 blocker, is a potent sleep modulator in rats.
When injected during the dark (active) period, AA-5-HT decreased wakefulness and increased both slow wave sleep and REM sleep in a dose-dependent manner. Interestingly, the same doses had no effect during the light (rest) period, when rats naturally sleep more.
AA-5-HT also blocked the wake-promoting effects of two stimulants: CBD and modafinil. When rats were given CBD or modafinil during their normal sleep period, AA-5-HT prevented the resulting increase in wakefulness and allowed normal sleep to occur.
In sleep homeostasis experiments, CBD and modafinil prevented normal sleep rebound after total sleep deprivation. AA-5-HT blocked this effect, allowing proper sleep recovery. AA-5-HT also reduced wake-related neurotransmitters (dopamine, norepinephrine, epinephrine, serotonin) while increasing adenosine, a key sleep-promoting molecule.
Why it matters
This study identifies AA-5-HT as a sleep-promoting agent that works through the endocannabinoid system. Its ability to enhance sleep specifically during active periods (without over-sedating during rest) and to restore sleep homeostasis after deprivation suggests therapeutic potential for insomnia.
The numbers in context
Three doses: 5, 10, 20 mg/kg. Effects seen only during dark period. AA-5-HT decreased dopamine, norepinephrine, epinephrine, serotonin and increased adenosine. Blocked wake-promoting effects of both CBD and modafinil.
How the study worked
Rats received AA-5-HT (5, 10, or 20 mg/kg i.p.) during lights-on or lights-off periods. Sleep-wake states were recorded via EEG/EMG. Power spectral analysis assessed sleep quality. Neurotransmitter levels were measured. Interactions with CBD and modafinil were tested during both normal conditions and after total sleep deprivation.
What this study cannot tell us
Animal study with intraperitoneal injection, not a clinically viable route. The interaction between AA-5-HT and CBD/modafinil is complex and may not translate directly to human pharmacology. Sleep architecture differs between rats and humans.
How to read the evidence
Comprehensive animal pharmacology study with multiple experimental paradigms. Preliminary because findings require human translation.
When this study was published
Published in 2017.
The bigger picture
The finding that CBD is wake-promoting (and that AA-5-HT blocks this effect) adds nuance to the popular perception of CBD as a sleep aid. CBD may actually promote wakefulness, while the sleep-promoting effects of the endocannabinoid system may work through anandamide enhancement and TRPV1 blockade.
Questions still open
- Could AA-5-HT or similar compounds be developed as sleep medications? Does this finding explain why some people report better sleep with cannabis while others feel more alert? Would oral AA-5-HT or related compounds be effective in human insomnia?
Common questions
Does CBD help you sleep?
Could the endocannabinoid system be targeted for insomnia?
Read the original research
Role of N-Arachidonoyl-Serotonin (AA-5-HT) in Sleep-Wake Cycle Architecture, Sleep Homeostasis, and Neurotransmitters Regulation.
Frontiers in molecular neuroscience, 10, 152
Citation
Murillo-Rodríguez, Eric; Di Marzo, Vincenzo; Machado, Sergio; Rocha, Nuno B; Veras, André B; Neto, Geraldo A M; Budde, Henning; Arias-Carrión, Oscar; Arankowsky-Sandoval, Gloria. (2017). Role of N-Arachidonoyl-Serotonin (AA-5-HT) in Sleep-Wake Cycle Architecture, Sleep Homeostasis, and Neurotransmitters Regulation.. Frontiers in molecular neuroscience, 10, 152. https://doi.org/10.3389/fnmol.2017.00152
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