Marijuana, REM Sleep, and Dreams
Discuss
Marijuana can affect how often you dream by rearranging your sleep cycle.
People who smoke marijuana before bed often struggle to recall their dreams the next morning. Yet, when these individuals stop smoking, they tend to experience more vivid dreams than before.
Marijuana is known to affect various aspects of sleep, including activities that are not involved with dreaming. But there’s a simple reason why marijuana users tend to have less dreams.
This phenomenon can be explained by how marijuana affects the sleep cycle, specifically a stage known as rapid eye movement (REM) sleep.
Marijuana and REM Sleep
The brain is most active during REM sleep and most dreaming is thought to occur during this stage. Numerous studies have shown that using marijuana before bed reduces REM sleep. Researchers believe this is why marijuana users report fewer dreams.
During the night, the brain cycles through 4 different stages of sleep, spending the most time in deep sleep (or slow-wave sleep) and REM sleep. The amount of time spent in these two stages is closely related. In fact, studies show that marijuana lengthens the time the brain spends in deep sleep, which leads to less REM sleep.
Ingesting THC or marijuana before bed also appears to reduce the density of rapid eye movements during REM sleep. Interestingly, less REM density has been linked to more restful sleep.
Most studies on marijuana and REM sleep have looked at the effects of THC. However, other compounds in marijuana may interfere with THC’s effect on sleep. For example, CBD has been found to promote wakefulness compared to taking THC alone.
What Happens When Quitting
Regular users of cannabis experience an abnormal increase in REM sleep when use is stopped. This is called the REM rebound effect, which leads to longer and denser periods of REM sleep. The REM rebound explains why cannabis users often experience highly vivid dreaming when trying to quit.
The sleep disturbances that occur during cannabis withdrawal usually begin 24-72 hours after quitting and can persist for up to 6-7 weeks.
Interestingly, the REM rebound is not unique to cannabis use. Other substances that interfere with sleep, such as alcohol and sleep medications, can cause REM rebound too. What’s more, people who are sleep deprived often undergo a rebound in non-REM sleep.
The rebound effect appears to be the body’s way of coping with being deprived of certain stages of sleep.
The Importance of REM Sleep
While healthy people should avoid taking substances that alter their sleep, it’s not clear whether the effect of marijuana on REM sleep is actually harmful. In fact, experts are still not sure why we need REM sleep.
On the other hand, deep sleep is believed to be the most important sleep stage for repairing and restoring the body. Likewise, studies show that when deprived of sleep, the brain prioritizes deep sleep over REM sleep.
While more research is needed, it’s possible that the ability of marijuana to increase deep sleep, even at the expense of REM sleep, might turn out to be a good thing.
This clears a lot up for me. I’ve experienced Sleep Paralysis for as long as I can remember, usually with no consistency. I’ll have it a couple times a week sometimes and then not have it again for months. This was even before I ever smoked weed. From the little research I’ve done on it, I found out almost everyone either gets it a few times in their life randomly or else it’s a chronic condition and they have it regularly. I have always wondered why my SP fits neither of those categories. I didn’t even know what SP was until a couple years ago. It makes sense now though, that I never have SP as long as I smoke occasionally, but when I run out, it comes back, because of the REM rebound.
I have been smoking off and on for about 4 years, and over the last 1-2 years I have been noticing patterns in my SP. During a stretch of smoking at least once per 1-2 weeks I never have SP. Which makes perfect sense after reading this article. Then, after at least a few weeks (usually more), I would have SP again, and it would usually happen a few times within a short time span and then go back to occurring sporadically. I quickly linked my smoking pattern with my SP pattern and figured it was the weed that was getting rid of my SP. However, I am wondering why the REM rebound is so delayed for me. You said it usually takes effect 24-72 hours after stopping smoking, but it’s more like a month for me. I guess it’s probably due to my already sporadic experiences.
Anyway, this stuff is very interesting. For now I think I’ll stick to the occasional smoke to fight off the SP demons. SP is no fun (for me or my roommates).
Thank you for writing this article.
REM sleep is a vital part of sleep and therefore health of a person. If you interfere with it there are adverse consequences, so best keep well away from doing so.
So any intoxicating substance should be taken in time for it to wear off before sleep. For me that is usually 4-5 hours before sleep. So last joint of the day is never later than 7pm.