The research on cannabis and sleep is weaker than its reputation. A Cochrane review published in October 2026, pooling 9 randomized trials with 537 participants, found that medical cannabis may have little to no clinically meaningful effect on sleep quality, total sleep time, or daytime functioning, and it rated that evidence very low to low certainty. Purple Buds does not recommend any product as a sleep aid.
Below is a summary of what the strongest studies found, including the parts that are less flattering than the marketing you may have seen.
What the major reviews concluded
The October 2026 Cochrane review on medical cannabis for insomnia is the most recent look at the trials. Its authors concluded that "Medical cannabis may have little to no clinically meaningful effect on quality of sleep/satisfaction with sleep, total sleep time, or daytime functioning." They also noted that cannabis "may result in a slight increase in adverse events," again with low certainty.
Earlier reviews point the same way. A 2020 systematic review by Suraev and colleagues found "insufficient evidence to support routine clinical use of cannabinoid therapies for the treatment of any sleep disorder."
A positive finding came from the National Academies of Sciences, Engineering, and Medicine in 2017. Its report on the health effects of cannabis found moderate evidence that cannabinoids, "primarily nabiximols," improved short-term sleep outcomes in people whose sleep was disturbed by obstructive sleep apnea, fibromyalgia, chronic pain, or multiple sclerosis. Two details get lost when that finding is repeated. Nabiximols is a pharmaceutical mouth spray, not flower or edibles. And the committee "did not identify any clinical trials that evaluated the effects of cannabinoids in patients with primary chronic insomnia."
What the CBN studies found
CBN, another cannabinoid, is often marketed with sleep in mind. Two recent human trials are worth knowing.
| Study | Who and how much | Main result |
|---|---|---|
| Lavender and colleagues, 2026, Journal of Sleep Research | 20 adults with insomnia disorder, one night each at 30 mg or 300 mg of CBN | No significant change in time spent awake after falling asleep, the main outcome |
| Bonn-Miller and colleagues, 2024, Experimental and Clinical Psychopharmacology | 293 people who reported poor sleep, 20 mg of CBN for seven nights | No significant effect on sleep quality, though the number of awakenings fell |
The 2026 trial reported some improvement in secondary measures at 300 mg, and its authors called for "Larger, longer trials." The 2024 study was run by researchers working for cannabis companies, which is worth knowing when you read its conclusions. Neither study supports a confident claim that CBN products help people sleep.
How regular THC use and sleep interact
Short-term and long-term effects can differ. A 2017 review in Current Psychiatry Reports put it this way: THC "may decrease sleep latency but could impair sleep quality long-term."
A 2025 meta-analysis by Velzeboer and colleagues looked at studies of sleep stages. It found that early reports of reduced dream sleep came mostly from small trials using high THC doses. The clearer pattern was what happens when regular users stop: "withdrawal from active cannabis use was consistently associated with sleep disturbances, including reduced total sleeping times and prolonged sleep onset latency, as well as REM rebounds."
National survey data shows how common that is. Among frequent cannabis users who met the criteria for cannabis withdrawal syndrome, sleep difficulty was reported by 68.2%, per a 2019 study by Livne and colleagues in Drug and Alcohol Dependence. Someone who uses cannabis most nights and then stops may find their sleep disrupted for a while.
Sleep apnea is a separate question
Obstructive sleep apnea is a medical condition, and the main professional body for sleep doctors has taken a clear position. In 2018 the American Academy of Sleep Medicine (AASM) stated that medical cannabis "should not be used for the treatment of OSA due to unreliable delivery methods and insufficient evidence of effectiveness, tolerability, and safety."
What we tell customers who ask
Purple Buds is an adult-use dispensary, and we do not sell any product as a sleep aid or a treatment. If you are dealing with ongoing sleep problems, a doctor is the right first conversation. New York runs a separate medical cannabis program through certified practitioners, and in July 2026 the state moved to extend patient certifications from one year to up to two years.
If you have questions about how different products compare in general, such as how THC and CBD differ, our THC vs CBD guide and our New York cannabis laws guide are good places to start, and our FAQ covers the basics of visiting the store.
Questions about cannabis and sleep
Does CBN help you sleep?
The human evidence so far does not show it clearly. A 2026 trial found no significant change in the main sleep outcome at 30 mg or 300 mg, and a 2024 trial at 20 mg found no significant effect on sleep quality, though people reported fewer awakenings.
Why do some people sleep badly after they stop using cannabis?
Sleep disruption is one of the most commonly reported symptoms of cannabis withdrawal in frequent users. Studies describe shorter total sleep, taking longer to fall asleep, and a rebound in dream sleep after stopping.
Is it safe to use cannabis if I have sleep apnea?
That is a question for your doctor. The AASM says medical cannabis should not be used to treat obstructive sleep apnea.