Evening routine
What does the research say about CBD and sleep?
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Mixed and early. The largest observational dataset, a 2019 chart review of 72 adults taking 25 mg of CBD daily, found sleep scores improved in 66.7 percent within the first month but fluctuated afterward (Permanente Journal). NCCIH regards CBD's effects on sleep in otherwise healthy people as uncertain, and a 2023 randomized trial found adding CBD to CBN changed nothing.
CBD and sleep is the question people ask most and the one the literature answers least cleanly. There are observational reports, one older review, a federal agency's cautious summary and a single large randomized trial that happened to include CBD. Here is what each one actually measured.
What did the observational data show?
The most-cited paper is a 2019 retrospective chart review in The Permanente Journal. Clinicians at a psychiatric outpatient clinic added CBD, mostly 25 mg once daily, to patients' usual care and tracked monthly scores. The final sample was 72 adults, 25 of whom were enrolled for poor sleep. Sleep scores improved within the first month in 48 patients, or 66.7 percent, but the authors report those scores fluctuated over the following months rather than holding steady. CBD was tolerated in all but 3 patients. The authors' own conclusion was that controlled trials are needed.
Two things limit that paper. It had no placebo group and no blinding, so expectation and the passage of time cannot be separated from the CBD. And the clinic population was receiving other care at the same time. It is a signal worth testing, not a result.
What did the review literature conclude?
A 2017 review in Current Psychiatry Reports surveyed cannabis and cannabinoid sleep research through 2014 and in detail from 2014 onward. Its summary of CBD was that preliminary evidence existed and that the field was early-stage with mixed results, calling for controlled, longitudinal research. On THC the review noted a possible shortening of time to fall asleep with a possible cost to sleep quality over time, a distinction that matters because full-spectrum products contain both.
NCCIH's current consumer summary is more cautious still. It notes that many cannabinoid studies examining sleep enrolled people with other conditions, so it is uncertain whether the products affected sleep directly or whether improvement in those conditions changed sleep, and it describes effects on sleep in otherwise healthy people as uncertain.
What did the randomized trial find?
The largest placebo-controlled test that included CBD was designed around CBN. The 2023 trial in Experimental and Clinical Psychopharmacology randomized adults with self-rated poor sleep to placebo, 20 mg of CBN, or 20 mg of CBN plus 10, 20 or 100 mg of CBD for seven nights, with 293 participants in the primary analysis. CBN alone reduced nighttime awakenings and overall sleep disturbance versus placebo. Adding CBD at any of the three doses did not enhance those effects, and no group differed from placebo on time to fall asleep or daytime fatigue.
That is the clearest controlled data point on CBD and sleep to date, and it is a null result for CBD as an add-on. It did not test CBD alone against placebo, so it does not close the question; it does mean the strongest trial so far gives CBD no credit.
One more data point comes from safety research rather than sleep research. The Phase I trial of purified CBD in CNS Drugs listed somnolence among the most common adverse events at doses of 1500 mg and above. Drowsiness at very high doses is a side effect, not evidence of a sleep benefit at consumer doses, and the two should not be conflated.
How should a reader weigh all this?
As an open question with a modest observational signal and no confirming trial. The Permanente authors asked for controlled studies in 2019; the 2023 trial delivered one that found nothing for CBD as an add-on. The Frontiers pharmacokinetics review's verdict on the field generally applies here too: "robust data from a variety of formulations is required." Anyone deciding whether to try CBD for a sleep routine is making a choice the evidence neither supports nor rules out, and should start low, keep a consistent routine, and judge results over weeks rather than nights.
This page is general information, not personalized guidance.
General information, not personalized guidance.
Sources
- Cannabidiol in Anxiety and Sleep: A Large Case Series The Permanente Journal, via PubMed (accessed 2026-10-13)
- Cannabis, Cannabinoids, and Sleep: a Review of the Literature Current Psychiatry Reports, via PubMed (accessed 2026-10-13)
- Cannabis (Marijuana) and Cannabinoids: What You Need To Know NCCIH, National Institutes of Health (accessed 2026-10-13)
- A double-blind, randomized, placebo-controlled study of the safety and effects of CBN with and without CBD on sleep quality Experimental and Clinical Psychopharmacology, via PubMed (accessed 2026-10-13)
- A Phase I, Randomized, Double-Blind, Placebo-Controlled, Single Ascending Dose, Multiple Dose, and Food Effect Trial of the Safety, Tolerability and Pharmacokinetics of Highly Purified Cannabidiol in Healthy Subjects CNS Drugs, via PubMed (accessed 2026-10-13)
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