REM sleep can be reduced through certain medications, substances, and environmental changes, but suppressing it comes with serious health risks. For every 5% reduction in REM sleep, the risk of death from any cause increases by 13% to 17%, according to research from the National Heart, Lung, and Blood Institute. Before trying to eliminate REM sleep entirely, it helps to understand why you want to and what targeted options exist for the specific problem you’re dealing with.
Why People Want to Stop REM Sleep
Most people searching for ways to stop REM sleep aren’t looking to eliminate dreaming for fun. They’re dealing with a specific problem that makes REM sleep feel dangerous or unbearable. The most common reasons include recurring nightmares (especially from PTSD), REM sleep behavior disorder (where you physically act out dreams, sometimes injuring yourself or a partner), or intense, disturbing dream activity that leaves you feeling exhausted instead of rested.
The approach that works best depends entirely on which of these problems you’re facing. Blanket REM suppression is rarely the right answer, but targeted treatments for nightmares, dream enactment, or trauma-related sleep disruption can be highly effective.
What Actually Suppresses REM Sleep
Several substances and medications reduce the amount of time your brain spends in REM. During normal sleep, certain brain cells that produce serotonin and norepinephrine go quiet, which allows REM to begin. Drugs that keep these chemical systems active effectively block or shorten REM periods.
Antidepressants are the most common REM suppressors. Both older tricyclic antidepressants and newer SSRIs reduce REM sleep as a side effect of boosting serotonin activity in the brain. Benzodiazepines, a class of sedatives, also suppress REM. These medications are sometimes prescribed specifically because of this effect, particularly for people with PTSD nightmares or REM sleep behavior disorder.
Alcohol and THC both reduce REM sleep as well. THC decreases both the number of rapid eye movements and the total duration of REM periods. Alcohol has a similar suppressive effect during the first half of the night. Neither is a good long-term strategy, for reasons covered below.
The REM Rebound Problem
Your brain tracks how much REM sleep it’s getting, and when it’s been shortchanged, it compensates aggressively. This is called REM rebound: a sudden surge in REM activity that includes longer REM periods, more frequent REM cycles, and notably more vivid or disturbing dreams.
REM rebound occurs after withdrawal from almost anything that suppresses REM. Stopping benzodiazepines, antidepressants, cannabis, alcohol, or stimulants all trigger it. Abruptly discontinuing serotonin-boosting antidepressants is particularly known for producing intensely vivid dreams during the rebound period. This means that if you use a substance to suppress REM and then stop, the nightmares or disturbing dreams you were trying to avoid often come back worse than before, at least temporarily.
This rebound effect is one of the strongest arguments against using substances casually to suppress REM sleep. It creates a cycle where you need the substance to avoid the very problem the substance withdrawal causes.
Treating Nightmares Without Eliminating REM
If nightmares are the core issue, the most effective non-drug approach is imagery rehearsal therapy. The technique works like this: while awake, you write out the narrative of a recurring nightmare, then deliberately change some element of the story (the ending, a detail, your response within the dream). You then spend time each day vividly imagining the new, revised version. Over time, this retrains your dreaming brain.
Meta-analyses show imagery rehearsal produces large improvements in nightmare frequency, sleep quality, and PTSD symptoms, with effects lasting through 6 to 12 months of follow-up. When combined with cognitive behavioral therapy for insomnia, sleep quality improves even further. The dropout rate is around 27%, which is somewhat higher than other cognitive-behavioral treatments, but for those who stick with it, the results are strong. Importantly, this approach lets you keep your REM sleep intact while changing what happens during it.
For trauma-related nightmares specifically, prazosin is a medication that works differently from general REM suppressors. Rather than blocking REM sleep itself, it lowers norepinephrine activity in the brain, which reduces the intensity of the stress response that fuels trauma nightmares. Doses typically start low at bedtime and are gradually increased. Effective doses vary widely, from around 2 mg in older adults to over 13 mg in some combat veterans.
Managing REM Sleep Behavior Disorder
REM sleep behavior disorder is a condition where the normal muscle paralysis that accompanies dreaming fails, allowing people to punch, kick, shout, or leap out of bed while dreaming. This is a situation where managing REM activity is medically necessary, not optional.
The American Academy of Sleep Medicine recommends two main treatments: clonazepam (a benzodiazepine) and immediate-release melatonin. Both are conditionally recommended, meaning they work for many patients but the choice depends on individual circumstances. These recommendations apply whether the disorder occurs on its own or alongside another medical condition.
Safety modifications to the bedroom are considered just as important as medication. This means removing sharp-edged furniture from beside the bed, placing soft mats on the floor to cushion falls, removing anything that could be grabbed and used as a weapon during sleep, and in severe cases, sleeping separately from a partner. Padding headboards and nightstand edges is also recommended.
Environmental Factors That Reduce REM
Temperature has a direct effect on REM sleep because your body partially loses its ability to regulate temperature during REM. The brain’s temperature-sensing neurons become much less responsive during dreaming sleep, which makes REM uniquely vulnerable to environmental heat or cold.
In studies of people sleeping without heavy bedding, any temperature above or below the thermoneutral zone (around 29°C or 84°F for an unclothed body) reduced REM sleep. Cold exposure suppresses REM particularly effectively because the body can’t mount a proper warming response while in that sleep stage, so the brain exits REM to protect itself. With normal bedding and clothing, this effect is blunted, and sleep remains stable across a wider temperature range (roughly 13°C to 23°C, or 55°F to 73°F).
Sleeping in a very cold or very hot room will reduce your REM sleep, but it also increases the time you spend awake and reduces deep sleep. It’s not a precision tool. You’ll sleep worse overall, not just dream less.
Why Eliminating REM Sleep Is Risky
REM sleep serves essential functions in memory consolidation, emotional processing, and brain maintenance. The research linking REM loss to mortality is striking: in studies of both middle-aged and older adults, every 5% drop in REM sleep was associated with a 13% to 17% increase in the risk of dying from any cause. This wasn’t limited to one demographic or one cause of death.
Chronic REM suppression through alcohol or cannabis use also degrades overall sleep architecture. Heavy cannabis users who recently stopped using showed lower total sleep time, less deep sleep, poorer sleep efficiency, and shorter REM latency (meaning the brain rushed into REM faster, a sign of REM debt) compared to drug-free controls.
The pattern is consistent: your brain needs REM sleep, and attempts to chronically suppress it either fail as tolerance builds, create a rebound problem when you stop, or carry measurable health consequences. The better path, for almost everyone searching this question, is not to eliminate REM but to treat the specific symptom that makes REM sleep distressing.