Getting more REM sleep comes down to protecting the conditions your brain needs to enter and sustain this stage: a consistent sleep schedule, a cool room, morning light exposure, and avoiding substances that suppress REM. Healthy adults spend about 20 to 22% of their total sleep in REM, which works out to roughly 90 to 110 minutes across a full night. Most of that REM time is concentrated in the second half of the night, so cutting sleep short by even an hour disproportionately cuts into your most REM-rich cycles.
What REM Sleep Actually Does
REM stands for rapid eye movement, and it’s the sleep stage where your brain is most active. Brain waves during REM closely resemble those of a fully awake person, yet your skeletal muscles are temporarily paralyzed. Only your eyes and your diaphragm (for breathing) keep moving. Your heart rate and blood pressure become elevated and variable compared to the deep, slow rhythms of earlier sleep stages.
This stage is where your brain processes emotional memories, particularly fear-based ones. During REM, slow theta-frequency brain waves strengthen the connections in prefrontal regions that suppress fear responses in the amygdala. This is essentially your brain filing away difficult experiences and turning down their emotional intensity. When REM sleep is disrupted, as it often is in PTSD, this process stalls, which may explain why people with the condition re-experience the same distressing dreams night after night. Beyond emotional processing, REM sleep supports learning, creative problem-solving, and the integration of new information with things you already know.
How REM Changes Through the Night
Sleep cycles through stages roughly every 90 minutes. In the first couple of cycles, deep sleep dominates and REM periods are short, sometimes only a few minutes. As the night progresses, deep sleep shrinks and REM periods grow longer. Your longest REM episodes happen in the final one or two cycles before waking. This is why sleeping six hours instead of eight doesn’t just cost you two hours of sleep. It costs you a large share of your total REM time, since those last cycles are where most of it lives.
Keep a Consistent Sleep Schedule
Your circadian clock governs when your body is primed for REM. That clock relies heavily on regularity. Going to bed and waking up at roughly the same time each day, including weekends, keeps your internal timing sharp so that REM-heavy cycles arrive on schedule in the early morning hours. Irregular schedules confuse circadian signaling, which can shorten or fragment REM periods even if your total sleep time stays the same.
Aim for seven to eight hours of total sleep. Because REM is back-loaded, you need a full night to collect it. Setting an alarm that gives you only six hours consistently shortchanges your most REM-dense cycles.
Get Bright Light in the Morning
Light is the most powerful signal your circadian clock receives. Specialized cells in your retina detect ambient light and relay that information to the brain’s master clock, which then adjusts your entire sleep-wake rhythm and controls the timing of melatonin release at night. Morning light advances the clock, anchoring your sleep to earlier, more stable hours. Evening and nighttime light does the opposite, pushing your clock later and delaying the onset of sleep.
Spending time outside in natural daylight, especially in the first hour or two after waking, has been shown to advance sleep timing, improve sleep quality, and support more consolidated nighttime sleep. Even on overcast days, outdoor light intensity far exceeds typical indoor lighting. In the evening, dim your lights and limit screen exposure to avoid sending a “daytime” signal that delays your body’s natural wind-down.
Cool Your Bedroom
REM sleep is particularly sensitive to temperature. Your body loses much of its ability to regulate its own temperature during REM, so the room you’re sleeping in matters more during this stage than any other. Research published in Frontiers in Neuroscience found that a room temperature of roughly 19 to 21°C (66 to 70°F) supports the best conditions for REM recovery. At that range, the skin maintains a microclimate between 31 and 35°C under the covers, which appears to be the sweet spot. Rooms that are too warm or too cold increase the likelihood of waking up mid-REM.
Avoid Alcohol and Other REM Suppressors
Alcohol is one of the most common and underappreciated enemies of REM sleep. It triggers the release of GABA, a calming neurotransmitter, in brainstem regions that are responsible for switching REM sleep off. The result is that higher doses of alcohol actively suppress REM, especially in the first half of the night. You may fall asleep quickly after drinking, but your brain spends less time in REM overall, and what REM you do get tends to be fragmented. Even moderate drinking in the evening can measurably reduce REM percentage.
Cannabis, many antidepressants, and some antihistamines also suppress REM sleep. If you’re taking a medication and notice changes in your dreaming (fewer or no dreams can be a sign of reduced REM), it’s worth discussing with your prescriber. Caffeine consumed too late in the day doesn’t suppress REM directly in the same way alcohol does, but it delays sleep onset, which shortens total sleep time and indirectly trims your REM-heavy final cycles.
Melatonin and REM Sleep
For people who already have reduced REM sleep, melatonin supplementation may help. In two randomized controlled trials, patients with below-normal REM duration took 3 mg of melatonin between 10 and 11 p.m. for four weeks. Their REM sleep percentage rose from about 14.7% to 17.8%, while the placebo group saw no improvement. Interestingly, the benefits didn’t disappear immediately after stopping. Patients who switched from melatonin to placebo retained some of the REM gains, with their percentage declining only slowly over time.
Melatonin appeared to work not by shifting the circadian clock but by improving REM sleep continuity, meaning fewer interruptions once REM periods started. If you’re already getting a healthy 20 to 22% REM, melatonin is unlikely to push you meaningfully higher. It seems most useful for people whose REM sleep is clearly below normal.
How Much REM Sleep You Actually Need
In a large analysis of polysomnography data across the adult lifespan, healthy 19-year-olds averaged about 21.7% of their sleep in REM. At age 40, that number held steady at roughly 21.2%. By 75, it dipped to about 18.8% before ticking back up slightly in the mid-80s. So while REM does decline somewhat with age, the drop is more modest than many people assume. For a healthy adult sleeping seven to eight hours, roughly 80 to 110 minutes of REM per night falls within the normal range.
How Accurate Are Sleep Trackers?
Consumer sleep trackers vary widely in their ability to detect REM specifically. A 2023 validation study compared 11 trackers against clinical polysomnography, the gold standard. Among wearable devices, the Fitbit Sense 2 scored highest for REM detection accuracy (F1 score of 0.66), followed closely by the Oura Ring 3 (0.60), the Galaxy Watch 5 (0.60), and the Google Pixel Watch (0.61). The Apple Watch 8 lagged behind at 0.44.
For context, an F1 score of 1.0 would mean perfect agreement with a clinical sleep lab, and 0.5 is roughly a coin flip. The best consumer wearables land in the mid-0.6 range for REM, which means they’re capturing a useful trend over weeks but can be off on any given night. REM was actually the stage where most trackers performed best compared to their accuracy for deep sleep or wake detection. Use your tracker’s REM data to spot patterns over time rather than obsessing over one night’s numbers.
Treat Sleep Disorders That Steal REM
Obstructive sleep apnea is a major, often undiagnosed thief of REM sleep. Because your muscles relax most deeply during REM, the airway is most vulnerable to collapse during this stage. People with untreated sleep apnea frequently get pulled out of REM by breathing disruptions, and their bodies may even learn to avoid REM as a protective response. If you snore heavily, wake up feeling unrefreshed despite enough hours in bed, or your partner has noticed you stop breathing during sleep, getting evaluated for apnea could be the single most effective thing you do for your REM sleep.