smoking weed in a dream

How Does Weed Affect Dreams?

According to various studies, stoners actually do dream less because weed reduces REM sleep. However, if you decide to take a break from smoking, those dreams will come back with a vengeance, more vivid than ever before.

As much as we don’t enjoy doing it, most stoners need to take a smoking hiatus every once in awhile. Whether it’s for a job, pregnancy, legal issues, or just a good old tolerance break, sometimes a few-week pause is necessary. If you’ve ever been there, you might have noticed one particular side effect after a day or two away from pot – crazy dreams!

Many smokers report that their dreams are more lucid and increase in frequency when abstaining from weed. A 2008 study [1] stated that regular cannabis use decreases REM sleep, which is the stage in our sleep cycle when dreams occur. The report concluded a “decreased REM duration in subjects dosed with 15mg of THC as well as a THC/CBD mixture, but did not record the effects of cannabis cessation,” although it’s believed that quitting does actually lead to something called a “REM rebound.”


While we sleep, our brains cycle through five different sleep stages, with the longest stages being deep sleep and REM sleep. Stage one is light sleep. This is when we’re still drifting in and out of consciousness and any little thing can wake us up. During stage one, you might feel sudden muscle cramps or the sensation that you’re falling.

Once we transition to stage 2, the electrical impulses in our brains slow down. During stage 3, what’s referred to as “delta waves” begin to appear with greater frequency. Delta waves are high-amplitude brain waves that originate in the thalamus or cortex and are associated with deep sleep. In stage 4, the brain is now exclusively producing delta waves and there is no eye movement or muscle activity.

Once we enter REM sleep, we finally begin to dream. Our breathing becomes irregular, heart rate increases, our eyes move rapidly in different directions and muscles become temporarily paralysed. Depending on how long we sleep, we could cycle through the REM stage quite a few times throughout the night.

A complete sleep cycle normally lasts about 100 minutes, with the first REM period starting between 70 to 90 minutes after we initially fall asleep. Early in our nightly cycles, the REM stage lasts around 10 to 20 minutes and gradually increases in length as we continue sleeping.


Despite the fact that REM sleep is restorative and has been linked to memory retention, there are a few benefits to skipping out on it. The main one being fewer nightmares, which is great news for PTSD patients. Nightmares, or night terrors, can prevent people from achieving a restful sleep, which can then have profound effects on waking behaviour, such as mood changes, trouble concentrating, low sex drive, weight gain and immune system suppression.

Pot’s dream-diminishing effects are extremely helpful for those who suffer from nightmares and/or insomnia. Furthermore, studies show that aside from some increased difficulty retaining information, a lack of REM sleep has little impact on our daytime behaviours, symptoms and overall health.

On the other hand, there is the possibility that cannabis doesn’t have an abstract effect on our dreams at all. Studies [2] do show the correlation, but there hasn’t been enough research to make a definitive conclusion yet. I can vouch for my personal experiences of intensified dreams after quitting pot, although I’ve also had some crazy dreams while smoking too. Either way, it’s worth exploring more to find out exactly how weed affects our subconscious minds.

According to various studies, cannabis reduces REM sleep. But once you stop smoking, those crazy, vivid dreams come back with a vengeance.

Why You Don’t Dream After Smoking Weed

You’d think getting blazed out of your mind would encourage crazy dreams, but the opposite is actually true. If fear is the mind-killer, as the stoner-classic novel Dune posits, then weed is the dream-killer. But when you stop smoking, your dreams may come back with a vengeance.

“On the few occasions that I don’t go to sleep stoned, my dreams are super intense,” says Rod*. “I always thought it had something to do with having used up all my mental imaging faculties being high.”

Good news for Rod, your brain doesn’t actually run out of pretty pictures, but smoking pot does change where those pictures come from. To understand this, you first have to look at sleep itself.

“Sleep is divided into several different stages,” says Dr. Elliott Lee of the Royal Sleep Disorders Clinic in Ottawa. Lee says that these stages can be lumped into two basic categories. “There’s REM [Rapid Eye Movement] sleep, sometimes called dreaming sleep. Everything else is non-REM sleep.”

Non-REM (NREM) sleep comes in three flavors: N1 sleep is when you’re just dozing off, transitioning from awake to asleep; N3, also called slow wave sleep (SWS), is “the most physically and mentally restorative,” according to Lee; N2 sleep occurs when you transition from one stage of sleep to another, say from N1 to REM, or from REM to N3—it’s the cream in your sleep Oreo.

Although REM is sometimes called dreaming sleep, we can also dream during NREM sleep. It’s just less likely, and we are even less likely to remember it. “About 80 percent of dreams that we have occur in REM sleep.” REM dreams are also freakier. While NREM dreams are typically about everyday stuff, REM dreams are the ones where you’re in a battle to the death with Jamie Lee Curtis in the yogurt aisle of a grocery store in Georgia. “They’re more emotional, more colorful,” says Lee.

Smoking weed becomes a major buzzkill for dreams in a couple of ways. “Cannabis is an extremely effective tool to combat insomnia, both falling asleep and staying asleep,” says Andrew Kuebbing and Felicia Carbajal of My Health Freedom, a cannabis advocacy group in California. Studies have shown that pot decreases sleep latency, the time it takes to actually get to sleep, and promotes SWS.

Is it dangerous to lose out on our dreams? We still don’t really know what REM sleep does, as SWS is what repairs our bodies and minds. I asked Dr. Lee if we know what function REM sleep serves. “Precisely? No. But we have a lot of theories.”

Image by B & J via Stocksy

The most promising theory, according to Lee, is the “sleep to forget/sleep to remember” theory. REM sleep may play a role in processing emotional memories. If something traumatic happens to you, it inscribes two different kinds of memories in your brain: declarative memory and emotional memory. Declarative memory refers to the specific details of what happened—the who, what, where, how, and sometimes why. Emotional memory is exactly what it sounds like: It’s how you felt as it was happening. In the immediate aftermath of a trauma, the emotional memories are jumbled up with declarative. You can’t recall details without the feelings. Dreams help you separate the emotions from the events, allowing you to move past the pain.

If you’re worried about missing out on your dreams, there’s a simple solution. “There is a ‘rebound’ period of high-REM sleep after cannabinoid therapies are discontinued,” says the My Health Freedom team. REM rebound occurs when you’ve been deprived of REM sleep. “If someone’s been up all night, for whatever reason, the next night the person will catch up on whatever sleep they missed,” says Lee. If there was no sleep, a priority will be placed on NREM sleep. But if you cheefed one too many doobers, passed out, and missed out on all your REM, your next sober night is likely to be a weird one.

REM rebound also happens after a night of hard drinking. In nondrinkers, alcohol shortens sleep latency and suppresses REM sleep for the first half of the night. After the alcohol has passed through your system, REM rebound occurs. This may be why many people report crazy dreams after a night of partying—your brain is having an after party. “I’ve had some of the weirdest, grossest dreams after a night of drinking,” says Yvonne*. “Recently I dreamt that my hair was caught in my teeth and I tried using it as dental floss but then my gums started bleeding and wouldn’t stop bleeding, but my blood was brown and I still couldn’t get all the hair out of my teeth.”

Being the thoughtful scientist that I am, I undertook an experiment to demonstrate REM rebound. I wrote down all my dreams for two nights: one sober, one sloshed. The sober night, my dreams were pretty standard issue. One was just remembering that Rob Delaney didn’t look all that disappointed when he didn’t win the Emmy for Outstanding Writing in a Comedy Series. All my dreams were devoid of emotion; I dreamt I was back at an old job but I didn’t have to answer the phone. Drunk night, on the other hand, was an emotional rollercoaster. I went to prom with Carson Daly and I was excited about it. My mother was chasing me through a lighthouse and I was terrified. My uber-political friends were driving people to vote and I was verklempt.

But don’t start knocking back that daily nightcap just yet. Dr. Lee says alcohol only helps you dream with infrequent, acute use: “The problem is when people use it chronically, it makes it harder to start sleeping, stay asleep, and it suppresses both stages of sleep. It’s kind of a trap.”

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Sleep scientists explain why getting high is a major buzzkill for your dreams.