Getting more REM sleep comes down to sleeping long enough, keeping a consistent schedule, and removing the things that suppress it. REM stages grow longer as the night progresses, with your first cycle lasting roughly 10 minutes and later ones stretching up to an hour. That means the final hours of sleep deliver the most REM, and anything that cuts your night short or fragments those later cycles hits REM disproportionately hard.
Why REM Loads Toward the End of the Night
Sleep moves through repeating cycles of lighter sleep, deep sleep, and REM, each cycle lasting about 90 minutes. Early in the night, your body prioritizes deep sleep for physical recovery, so the REM portions are brief. As the night goes on, deep sleep shrinks and REM expands. By the last couple of cycles before you wake up, REM can account for the majority of each 90-minute block.
This back-loaded pattern has a practical consequence: if you regularly sleep six hours instead of seven or eight, you’re not losing an equal share of each sleep stage. You’re losing a disproportionate amount of REM. The same applies if you set an alarm that cuts into your final sleep cycle. Protecting those last hours of sleep is the single most effective thing you can do to increase your REM time.
Keep a Consistent Sleep Schedule
Your brain’s internal clock determines when it cycles through sleep stages, and that clock runs most smoothly when you go to bed and wake up at roughly the same time every day. Shifting your schedule by even an hour or two on weekends can throw off the timing of your sleep cycles, reducing how efficiently your brain transitions into REM during the second half of the night. Consistency doesn’t just help you fall asleep faster. It helps your brain organize its sleep architecture so that REM arrives on schedule and lasts as long as it should.
How Alcohol Suppresses REM
Alcohol is one of the most common REM disruptors, and it works in two ways. First, it directly suppresses REM sleep during the first half of the night. You may fall asleep quickly and spend more time in deep sleep early on, which can feel like a good night’s rest at first. But during the second half of the night, as your body metabolizes the alcohol, a rebound effect kicks in. Sleep becomes fragmented, and the REM time you lost earlier doesn’t fully recover.
The net result is less total REM and lower-quality sleep overall, even if you stayed in bed for a full eight hours. REM is when your brain consolidates memories, processes emotions, and supports learning and concentration. Drinking even moderately in the evening can undercut all of those functions. If you’re specifically trying to improve your REM sleep, reducing or eliminating evening alcohol is one of the highest-impact changes you can make.
Medications That Reduce REM
Several classes of antidepressants significantly suppress REM sleep. SSRIs, the most commonly prescribed type, reduce REM duration. Older classes of antidepressants called tricyclics produce even stronger REM suppression, and one older class (MAOIs) can eliminate REM sleep almost entirely. These effects often appear immediately, well before the medication’s mood benefits kick in.
Not all antidepressants behave this way. Some newer options, including mirtazapine and trazodone, do not systematically reduce REM in either short-term or long-term use. If you’re on an antidepressant and concerned about your sleep quality, this is worth discussing with your prescriber. Stopping or switching medications on your own can cause serious withdrawal effects.
Set Your Bedroom Temperature
Your body temperature naturally drops during sleep, and a cool room supports that process. The Cleveland Clinic recommends keeping your bedroom between 60 and 67°F (about 15 to 19°C), noting that this range helps facilitate the stability of REM sleep specifically. A room that’s too warm doesn’t just make it harder to fall asleep. It can cause more awakenings during the night, fragmenting the later sleep cycles where REM is concentrated.
If you tend to sleep hot, lighter bedding, breathable fabrics, or a fan can help you stay in that range without cranking the air conditioning. The goal is for your core body temperature to drop and stay low through the night, giving your brain uninterrupted access to its longest REM periods.
Sleep Apnea and REM Fragmentation
Obstructive sleep apnea, where the airway repeatedly collapses during sleep, is typically worse during REM than during other stages. During REM, the muscles in your upper airway relax more completely due to the same mechanism that paralyzes your body to prevent you from acting out dreams. That extra relaxation makes the airway more likely to collapse, leading to more frequent breathing interruptions during the very stage you’re trying to protect.
The fragmentation caused by these interruptions can significantly reduce total REM time. Many people with untreated sleep apnea don’t realize they’re waking dozens of times per hour during REM. They just know they feel unrested, groggy, and unable to concentrate. If you snore heavily, wake up with headaches, or feel exhausted despite spending enough time in bed, sleep apnea could be the reason your REM sleep is suffering. Treatment with a CPAP or similar device often produces a dramatic REM rebound in the first few nights, as the brain finally gets uninterrupted access to the stage it’s been missing.
Other Habits That Support REM
Beyond the major factors, several smaller habits add up. Caffeine consumed even six hours before bed can reduce total sleep time and fragment later sleep cycles. Nicotine is a stimulant that lightens sleep and increases nighttime awakenings. Both work against REM by disrupting the second half of the night.
Exercise generally improves sleep quality and increases both deep sleep and REM, but timing matters. Vigorous exercise within a couple of hours of bedtime can raise your core temperature and delay sleep onset. Morning or afternoon workouts tend to produce the cleanest benefit.
Limiting bright light exposure in the hour or two before bed also helps. Bright screens and overhead lights suppress melatonin production, which delays your body’s signal that it’s time to sleep. A later sleep onset means fewer total sleep cycles, and since REM is back-loaded, the lost cycles are the ones richest in REM. Dimming lights and shifting to warmer-toned screens in the evening gives your internal clock a clearer signal that the night has started.
How Much REM You Actually Need
In a healthy adult sleeping seven to eight hours, REM typically accounts for about 20 to 25 percent of total sleep time, roughly 90 to 120 minutes spread across four to five cycles. You don’t need to track this precisely. If you’re sleeping long enough, on a consistent schedule, in a cool room, without alcohol or stimulants interfering, your brain will generally get the REM it needs without any special effort.
Consumer sleep trackers can give you a rough sense of your REM trends over time, but they’re not accurate enough to diagnose a problem on any single night. A better gauge is how you feel: REM deprivation shows up as difficulty concentrating, emotional reactivity, poor memory for recent events, and a foggy or “off” feeling that persists even when you’ve technically slept enough hours. If those symptoms sound familiar and your sleep habits are already solid, a clinical sleep study can measure your actual sleep architecture and identify issues like apnea that home trackers miss.