Some frequent cannabis users notice something interesting when they stop: dreams suddenly become vivid, strange and unusually memorable. Others say they rarely remember dreaming while using cannabis regularly. The explanation involves REM sleep, the brain's memory systems and what happens when THC is removed. Research suggests cannabis can change the timing and structure of sleep, but it does not establish that users stop dreaming. In many cases, the difference may be less about whether a dream happens and more about whether the person remembers it.
You Can Dream Without Remembering a Thing
The most vivid, story-like dreams are commonly associated with rapid eye movement (REM) sleep, the stage of sleep characterized by rapid movements of the eyes. But dreaming is not exclusive to REM. People also experience dreams during non-rapid eye movement (NREM) sleep.
A 2017 study by Francesca Siclari and colleagues used high-density electroencephalography (EEG), which records electrical activity across the brain, alongside repeated awakenings to investigate when people experience dreams.
In a small group of trained participants, dream experiences were reported after approximately 95% of awakenings from REM sleep and 71% of awakenings from NREM sleep. Those figures count any reported experience — including experiences whose content was not remembered — not full recalled dream stories.
The researchers identified a posterior cortical "hot zone," an area toward the back of the brain whose activity was associated with reported dream experiences during both REM and NREM sleep — and showed that monitoring this region could predict reported dream experiences during NREM sleep.
An important distinction emerged: experiencing a dream and remembering its contents after waking are two different things.
A person can experience a dream without retaining its storyline. Dream memories also fade quickly unless someone wakes during or shortly after the experience.
That distinction matters when discussing cannabis. Someone who rarely remembers dreams may still be dreaming regularly.
What Happened When Scientists Gave THC to Sleeping Volunteers?
Some of the earliest controlled research into THC and REM sleep came from studies published by Feinberg and colleagues in 1975.
Researchers gave experienced cannabis users THC doses beginning at 70 milligrams per day and increasing to 210 milligrams per day. Four subjects completed the main study sequence, while three additional subjects were studied during the higher-dose and withdrawal phases. The doses were very high.
THC significantly reduced eye-movement activity during REM sleep and, to a lesser extent, reduced the amount of time spent in REM.
The researchers also observed what happened when participants abruptly stopped taking THC.
Both REM measures increased above their original baseline levels. The rebound was particularly pronounced in eye-movement activity.
Deep stage 4 sleep also tended to increase while participants were taking THC, although that change was not statistically significant.
A companion study published in 1976 using marijuana extract found the same general pattern.
These early experiments helped establish the connection between THC exposure, REM activity and what became known as REM rebound. However, their very small samples and unusually high doses limit how broadly their findings can be applied.
A Modern Study Found Less REM and Less Total Sleep
A modern trial — published online in July 2025 and appearing in the Journal of Sleep Research's February 2026 issue — brought the question back into a clinical setting.
Suraev and colleagues studied 20 patients with insomnia disorder in a randomized crossover trial using high-density EEG.
Participants received a single oral dose containing 10 milligrams of THC and 200 milligrams of CBD, as well as a placebo for comparison.
Following the cannabinoid combination, researchers measured:
Total sleep time decreased by 24.5 minutes.
REM sleep decreased by 33.9 minutes.
The first REM period was delayed by 65.6 minutes.
Researchers found no measurable impairment in objective next-day alertness, cognitive performance or simulated driving. Participants did, however, report a small but statistically significant increase in subjective sleepiness the following morning. Their subjective sleep quality remained unchanged.
The findings demonstrate that a THC-containing product can alter REM timing and duration under particular experimental conditions.
But the results should not be treated as a universal description of cannabis and sleep. The study involved a specific combination of THC and CBD, a single dose and a small group of patients with insomnia.
Sometimes THC Does Not Change REM at All
Not every controlled study has found REM suppression.
In a 2004 crossover study, Nicholson and colleagues examined eight healthy volunteers who received different cannabinoid combinations.
Fifteen milligrams of THC alone had no effect on nocturnal sleep.
The THC and CBD combinations produced different results. They decreased stage 3 sleep, and the higher combination increased wakefulness.
The researchers concluded that 15 milligrams of THC produced sedative effects on next-day measures, while the combination of 15 milligrams of THC and 15 milligrams of CBD appeared to counteract some of those effects and increase wakefulness during sleep. Because CBD was not tested alone, the study cannot establish its independent effect on sleep.
This is an important counterpoint to the idea that THC always reduces REM sleep.
Dose, formulation and the combination of cannabinoids matter. The available research does not establish one consistent sleep response across all cannabis products and users.
What Happens in the Bedrooms of Regular Cannabis Users?
Laboratory studies provide controlled conditions, but researchers have also examined cannabis use in people's everyday environments.
A 2024 study by Althoff and colleagues investigated 177 healthy adults in Colorado using home sleep testing and cannabinoid metabolite measurements.
Participants who used cannabis within three hours of going to sleep spent more time awake after initially falling asleep.
The median was 60.5 minutes among recent users, compared with 45.8 minutes among those who had not used cannabis within that period.
Recent use was also associated with more light stage 1 sleep.
The researchers identified additional differences among frequent users, defined as people using cannabis more than 20 days per month.
These participants had longer REM latency, meaning it took longer to reach their first REM period, and lower sleep efficiency, a measure of how much time in bed was actually spent sleeping.
However, in the comparison between people who had used cannabis within three hours of bedtime and those who had not, the overall percentage of REM sleep did not differ. The picture has one more wrinkle: higher cannabinoid metabolite concentrations were associated with lower REM percentages — an observational association that does not establish causation.
That distinction is important. The clearest differences were in REM timing and sleep efficiency, not a simple across-the-board loss of REM sleep.
Why the Dream May Disappear Even When the Dream Does Not
The research becomes easier to understand when two separate processes are considered together.
First, THC can alter REM sleep. Some studies have found reduced REM duration or delayed REM onset, particularly in high-dose experimental conditions.
Second, remembering a dream requires the experience to survive the transition into waking memory.
Dream recall is fragile. If someone does not wake during or shortly after a dream, its contents can fade quickly.
Together, these findings offer a possible explanation for why some frequent cannabis users report remembering fewer dreams.
They may experience changes in REM timing or duration under certain conditions, while the dreams that do occur may not be retained after waking.
There is also a reason so many people reach for cannabis at night in the first place. As Babson and colleagues summarized in a 2017 review, THC taken acutely shortens the time it takes to fall asleep in many studies — but with nightly use, tolerance develops. And sleep disruption during abstinence is a recognized withdrawal symptom that may contribute to lapse or relapse during attempts to quit.
However, the distinction between dreaming and dream recall is essential. The research does not establish that frequent cannabis users stop dreaming or that reduced dream recall is caused exclusively by REM suppression.
A 2014 review by Gates, Albertella and Copeland examined 39 publications on cannabis and sleep. Reduced REM sleep and reduced REM density were among the more consistent findings in earlier research, but methodological problems prevented definitive conclusions.
A 2025 systematic review and meta-analysis by Velzeboer and colleagues examined 18 polysomnography studies, with nine included in the meta-analysis.
Polysomnography is a comprehensive sleep study that records measurements such as brain activity, eye movements and other physiological signals to assess sleep stages and patterns.
The researchers found that cannabis did not consistently change sleep duration, sleep latency, time awake, sleep efficiency or sleep-stage distribution.
The older REM-reduction findings came largely from small studies using high THC doses. More recent studies using lower doses produced mixed findings and often found no REM suppression.
One result was more consistent: withdrawal from regular cannabis use was associated with sleep disturbances, including REM rebound.
Stop Using Cannabis and the Dreams Can Come Back
For some frequent users, the most noticeable change happens after they stop.
A 2003 study by Budney and colleagues followed 18 heavy cannabis users through five days of use and 45 days of abstinence.
Participants reported several withdrawal symptoms, including difficulty sleeping and strange dreams.
Sleep difficulty, craving, anger and anxiety began during days one through three and generally peaked between days two and six.
Most withdrawal symptoms settled within approximately two weeks.
Strange dreams were different. They remained significantly elevated throughout the full 45-day observation period.
The earlier Feinberg experiments offer a possible physiological explanation.
When THC exposure stopped, REM eye-movement activity and REM duration rose above baseline. This is known as REM rebound, a temporary increase in REM activity following its suppression.
The 2025 review by Velzeboer and colleagues also identified sleep disturbance and REM rebound as consistent features of cannabis withdrawal.
The important point is that vivid dreams during abstinence do not establish that something has been permanently damaged. Budney and colleagues added a caveat of their own: they could not fully rule out that persisting symptoms partly reflected underlying sleep problems returning once cannabis use stopped.
REM rebound is a homeostatic response, meaning the body adjusts its sleep activity following a period of alteration.
The experience can be uncomfortable or surprising, but the research identifies it as a documented feature of withdrawal.
Can Suppressing Dreams Actually Be a Treatment?
There is another side to this research.
For some people, recurring and distressing dreams are not something they want more of.
A 2015 randomized, double-blind, placebo-controlled crossover trial investigated nabilone, a synthetic cannabinoid, in 10 Canadian military personnel experiencing PTSD-related nightmares that had not responded to standard treatment.
Participants received nabilone in doses ranging from 0.5 to 3.0 milligrams.
The researchers found that recurring and distressing dream scores decreased by 3.6 points with nabilone, compared with 1.0 point with placebo.
Half of the participants receiving nabilone were rated much improved, compared with approximately one in nine receiving placebo.
The researchers described the findings as preliminary and emphasized the need for replication in a larger group.
The study does not establish cannabis as a general treatment for nightmares. It examined a specific synthetic cannabinoid in a very small group of people with treatment-resistant PTSD nightmares.
It does, however, illustrate that cannabinoid-related changes in dreaming can have different implications depending on the person and the condition being studied.
Does CBD Keep Your Dreams Normal?
CBD is frequently discussed alongside THC, but the evidence concerning CBD and dreaming is limited.
There is no solid human evidence establishing that CBD alone suppresses REM sleep or dreams.
The 2004 Nicholson study did not include a CBD-only treatment arm. In combination, CBD appeared to counteract some of THC's next-day sedative effects — but it was never tested on its own.
That does not establish that CBD protects REM sleep.
Claims that CBD keeps dreams normal or prevents THC-related dream changes remain unverified.
The available research does not support treating CBD as a proven safeguard against changes in dreaming.
What Should You Take Away From the Research?
The idea that cannabis users stop dreaming is not supported by the evidence.
Dreaming occurs during both REM and NREM sleep. THC can reduce or delay REM under certain conditions, but the broader research does not show consistent REM suppression across all doses, products and users.
The more useful distinction is between dreaming and remembering.
Some frequent users may remember fewer dreams because of changes in sleep timing and the fragile nature of dream recall. When regular use stops, withdrawal-related sleep disruption and REM rebound can make dreams unusually vivid or strange.
The research also challenges the idea that cannabis simply trades dreams for deeper, better sleep. Early studies found a nonsignificant tendency toward increased deep sleep, while other research identified more nighttime wakefulness, more light sleep or reduced total sleep time.
Cannabis and sleep remain an active area of research, and the findings are not uniform.
For anyone noticing changes in their dreams, the important questions are not simply whether they dream, but how their sleep is changing, whether they are using cannabis regularly and what happens when that use changes.
The dreams may never have disappeared. You may simply have stopped remembering them.
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Sources
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- Feinberg, I., et al. "Effects of High Dosage Delta-9-Tetrahydrocannabinol on Sleep Patterns in Man." Clinical Pharmacology & Therapeutics, 1975;17(4):458–466. doi:10.1002/cpt1975174458. Early controlled research involving experienced cannabis users that documented reduced REM eye-movement activity and REM duration during high-dose THC exposure, followed by REM rebound after abrupt withdrawal.
- Feinberg, I., et al. "Effects of Marijuana Extract and Tetrahydrocannabinol on Electroencephalographic Sleep Patterns." Clinical Pharmacology & Therapeutics, 1976;19(6):639–655. doi:10.1002/cpt1976196639. Reported the same general pattern of REM changes and rebound following withdrawal.
- Suraev, Anastasia, 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;35(1):e70124. doi:10.1111/jsr.70124. Examined a single oral dose of 10 mg THC and 200 mg CBD in 20 patients with insomnia, finding reduced total sleep time and REM duration and delayed REM onset.
- Nicholson, A. N., et al. "Effect of Δ9-Tetrahydrocannabinol and Cannabidiol on Nocturnal Sleep and Early-Morning Behavior in Young Adults." Journal of Clinical Psychopharmacology, 2004;24(3):305–313. doi:10.1097/01.jcp.0000125688.05091.8f. Examined THC and CBD combinations in eight healthy volunteers, including the finding that 15 mg THC alone had no effect on nocturnal sleep.
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- Budney, Alan J., et al. "The Time Course and Significance of Cannabis Withdrawal." Journal of Abnormal Psychology, 2003;112(3):393–402. doi:10.1037/0021-843X.112.3.393. Followed 18 heavy users through use and 45 days of abstinence, documenting withdrawal-related sleep difficulties and strange dreams that remained elevated throughout the observation period.
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