Cannabis and Sleep: What the Latest Research Says

If you've ever reached for cannabis before bed, you're far from alone. A University of Michigan study published in late 2025 found that roughly 18% of young adults in the U.S. use cannabis specifically to help them fall asleep^[1]. Walk into any New York dispensary and ask what people buy for nighttime use, and the answer is consistent: indica-leaning flower with relaxing terpene profiles.

But what does the science actually say? The past year has produced a wave of new studies on cannabis and sleep, and the findings paint a picture that is both encouraging and more nuanced than most people expect. Here's what you need to know.

The Promising News: Sustained Improvements in Sleep Quality

One of the most compelling recent studies comes from the UK Medical Cannabis Registry. Published in PLOS Mental Health in August 2025, researchers led by Arushika Aggarwal at Imperial College London tracked 124 patients diagnosed with primary insomnia who were prescribed cannabis-based medicinal products^[2]. Over an 18-month period, these patients reported sustained improvements in subjective sleep quality at every follow-up point, from one month through a year and a half. Anxiety scores also improved significantly throughout the study.

What makes this study particularly relevant is the population it examined: people with diagnosed insomnia, many of whom had already tried conventional sleep medications without success. The findings suggest that cannabis may offer a meaningful alternative for people who haven't responded well to traditional treatments.

The safety profile was also reassuring. Out of 124 participants, adverse events were reported by a small subset, and none were classified as disabling or life-threatening^[2].

The Nuance: Not All Sleep Is Created Equal

Here's where the research gets more complex. While many cannabis users report falling asleep faster and sleeping more soundly, objective measurements reveal a more layered story.

A groundbreaking 2026 pilot trial published in the Journal of Sleep Research was the first to use high-density EEG to measure the actual effects of oral THC and CBD on brain activity during sleep^[3]. Using a single dose of medical-grade cannabis oil containing 10 mg THC and 200 mg CBD, researchers found that the combination reduced cortical hyperarousal during lighter sleep stages. That's the kind of brain overactivity that keeps people lying awake despite being exhausted.

However, the same study found that the THC/CBD combination reduced total sleep time and REM sleep. REM is the sleep stage associated with dreaming, memory consolidation, and emotional processing. For people who struggle with racing thoughts at bedtime, reduced cortical arousal could be genuinely helpful, but the trade-off with REM sleep is worth understanding.

A separate systematic review published in Sleep Medicine Reviews in 2025 echoed this complexity. Across multiple studies, cannabis did not consistently change objective sleep metrics like total duration, time to fall asleep, or sleep efficiency^[4]. The review noted that earlier research showing REM suppression was often based on small trials with high THC doses, and more recent studies using moderate, therapeutic doses have produced mixed results.

THC, CBD, or Both? What the Data Suggests

One of the most common questions cannabis consumers ask is whether THC or CBD is better for sleep. The research points toward formulations that include THC, or a combination of both cannabinoids, as showing the strongest sleep-related benefits.

A 2025 meta-analysis covering six randomized controlled trials and more than 1,000 patients found that cannabinoid formulations improved subjective sleep quality, and that the effect was driven primarily by products that were not exclusively CBD^[5]. In other words, THC appears to play an important role in the sleep benefits that cannabis users report.

That said, the combination of THC and CBD together may offer the most balanced experience. The 2026 EEG study used a 1:20 ratio of THC to CBD (10 mg THC with 200 mg CBD), and found reduced hyperarousal without significant impairment the next morning^[3]. CBD may help temper some of THC's more stimulating or anxiety-producing effects at higher doses, creating a smoother path to sleep.

For those new to using cannabis for sleep, this is worth keeping in mind. If you find that high-THC flower keeps your mind buzzing rather than winding down, it may not be the cannabinoid content alone. Your strain's terpene profile plays a significant role too.

The Terpene Connection: Why Your Strain Choice Matters

Beyond cannabinoids, terpenes are emerging as key players in the sleep conversation. These aromatic compounds shape the character of each cannabis strain, and the latest research suggests they do far more than just influence flavor and aroma.

Myrcene is the terpene most associated with sedation and deep relaxation. It's the most abundant terpene in cannabis overall, and strains that are high in myrcene tend to produce the heavy, body-focused calm that many people seek before bed^[6].

Linalool, the same terpene responsible for lavender's calming reputation, is found in many indica-leaning cannabis strains. Early research suggests it may support relaxation and reduce anxiety^[7], making it a natural complement to myrcene for evening use.

One line of early research from the University of Arizona reported that, in animal models, individual terpenes including linalool and beta-caryophyllene appeared to reduce pain-related behaviors at magnitudes researchers described as comparable to morphine^[8]. These were preclinical findings (not human clinical trials) and no conclusions about pain relief in people can be drawn from them yet. Still, it is one reason researchers are paying closer attention to the role terpenes may play alongside cannabinoids.

Beta-caryophyllene is unique among terpenes because it has been shown in laboratory studies to interact with the body's CB2 cannabinoid receptors^[9]. Early research associates it with potential stress-relief and anti-inflammatory activity, though human clinical data is still limited. You'll find it prominently in many of our strains, including King Kong and Deep Space.

Strains to Consider for Evening Use

If you're looking for cannabis flower that aligns with what the research suggests for better sleep, focus on indica-leaning strains with myrcene, linalool, and caryophyllene in the terpene profile. Here are a few from our menu worth exploring.

A Few Things to Keep in Mind

The research on cannabis and sleep is encouraging but still evolving. A few practical considerations worth noting:

Tolerance can develop. The UK insomnia study found that while sleep improvements were sustained over 18 months, the magnitude of improvement declined somewhat over time^[2]. This aligns with what many experienced consumers already know: taking periodic breaks can help maintain the effectiveness of cannabis for sleep.

Context matters. A 2025 prospective study published in Addiction found that frequent cannabis use may improve sleep for people who also experience depression or anxiety, but could worsen sleep for those without these conditions^[10]. Your individual response depends on what's driving your sleep difficulties in the first place.

Start low and pay attention. If you're new to using cannabis for sleep, begin with a lower THC percentage and an indica-leaning strain. Give yourself time to notice how different strains and doses affect not just how quickly you fall asleep, but how you feel the next morning.

Withdrawal affects sleep. Multiple studies have noted that stopping cannabis after regular use can temporarily disrupt sleep^[4]. This is worth being aware of if you plan to take tolerance breaks.

The Bottom Line

The science of cannabis and sleep has come a long way. Recent studies suggest that cannabis, particularly formulations containing THC and strains rich in calming terpenes like myrcene and linalool, can meaningfully improve sleep quality for many people. The research is most encouraging for those dealing with insomnia or anxiety-related sleep difficulties.

At the same time, the relationship between cannabis and sleep architecture is complex. The most informed approach is to choose your strains thoughtfully, start with moderate doses, and pay close attention to what works for your body. Every Greenline Apothecary strain comes with detailed terpene and THC information to help you make that choice. Browse our full menu and find the right flower for your evening ritual.

Frequently Asked Questions

Does cannabis help you sleep?

Recent research suggests that cannabis may improve subjective sleep quality for many people, particularly those with insomnia or anxiety-related sleep difficulties. A 2025 study from the UK Medical Cannabis Registry found sustained improvements in sleep quality over 18 months of medical cannabis use. However, the science is nuanced: some studies show that while people report sleeping better, objective measurements tell a more complex story, especially regarding REM sleep. Individual response varies depending on the cannabinoid formulation, dosage, and the person's existing health conditions.

What is the best cannabis strain for sleep?

For sleep, most consumers reach for indica-leaning strains that are high in the terpenes myrcene and linalool. Myrcene is associated with sedating, relaxing effects, while linalool (the same terpene found in lavender) may support calm and relaxation. Research suggests that the specific terpene profile matters more than the indica or sativa label. Strains with a combination of moderate THC and calming terpenes tend to be the most popular choices for evening use.

Does THC or CBD work better for sleep?

Research suggests that formulations containing THC, or a combination of THC and CBD, tend to show stronger sleep-related benefits than CBD alone. A 2025 meta-analysis found that improvements in sleep quality were driven primarily by formulations that were not exclusively CBD. A 2026 pilot trial using 10 mg THC with 200 mg CBD found that the combination reduced cortical hyperarousal during lighter sleep stages. However, higher THC doses may reduce REM sleep, so moderate dosing and consulting with a healthcare provider is recommended.

Which terpenes help with sleep?

The two terpenes most associated with sleep and relaxation in early research are myrcene and linalool. Myrcene, the most common cannabis terpene, produces earthy aromas and has been linked to sedating effects in preclinical studies. Linalool, also found in lavender, is associated with calming and relaxation. Preclinical animal research from the University of Arizona also explored whether terpenes like linalool and beta-caryophyllene can reduce pain-related behaviors. These were not human clinical trials, and no claim of treatment benefit can be drawn from them. Human clinical data on terpenes and sleep is still limited.

References

1. Patrick ME, Schulenberg JE, Miech RA, et al. Monitoring the Future Panel Study annual report: National data on substance use among adults ages 19 to 65, 1976-2023. JAMA Pediatrics. 2025. University of Michigan
2. Aggarwal A, Erridge S, Cowley I, et al. UK Medical Cannabis Registry: A clinical outcomes analysis for insomnia. PLOS Mental Health. 2025;4(2):e0000390. doi:10.1371/journal.pmen.0000390
3. Suraev A, et al. Acute effects of oral cannabinoids on sleep and high-density EEG in insomnia: A pilot randomised controlled trial. Journal of Sleep Research. 2026;e70124. doi:10.1111/jsr.70124
4. Cannabis and sleep architecture: A systematic review and meta-analysis. Sleep Medicine Reviews. 2025. PubMed:40967124
5. Effectiveness of cannabinoids on subjective sleep quality in people with and without insomnia or poor sleep: A systematic review and meta-analysis of randomised studies. Sleep Medicine Reviews. 2025. ScienceDirect
6. LaVigne JE, Hecksel R, Keresztes A, et al. Cannabis sativa terpenes are cannabimimetic and selectively enhance cannabinoid activity. Scientific Reports. 2021;11:8232. doi:10.1038/s41598-021-87740-8
7. Weston-Green K, Clunas H, Jimenez Naranjo C. A review of the potential use of pinene and linalool as terpene-based medicines for brain health. Frontiers in Psychiatry. 2021;12:583211. doi:10.3389/fpsyt.2021.583211
8. University of Arizona Health Sciences. Study shows cannabis terpenes may relieve chemotherapy-induced neuropathic pain. 2021. UArizona Health Sciences
9. Bahi A, Al Mansouri S, Al Memari E, et al. Beta-caryophyllene, a CB2 receptor agonist produces multiple behavioral changes relevant to anxiety and depression in mice. Physiology & Behavior. 2014;135:119-124. PubMed:24930711
10. Cannabis use and sleep problems among young adults by mental health status: A prospective cohort study. Addiction. 2025. PubMed:39476498