i’ve googled “how to increase rem sleep” more times than i’d like to admit. usually at like 11pm, after checking my sleep app and seeing that little rem bar looking pathetically short again.
the thing is — i was going about it completely backwards. i kept trying to add things. new supplements, earlier bedtime, some breathing technique i read about. none of it worked in any lasting way. not because those things are useless but because i was treating rem like a thing i could chase. you can’t really chase it. what you actually do is figure out what’s been blocking it, remove that, and then it just… comes back. your brain already knows how to do this. it doesn’t need your help, it needs you to stop getting in the way.
took me an embarrassingly long time to understand the difference. here’s the version i wish someone had handed me.
the end-of-night problem nobody talks about
okay so rem sleep — rapid eye movement — is the stage where your brain runs at near-waking speed, your eyes move around behind your eyelids, and most of the vivid dreaming happens. it’s also doing a lot of emotional filing and memory consolidation work during this time. the stuff that makes you feel like yourself the next day — emotionally regulated, able to think clearly, not just… running on fumes — that’s largely rem doing its job overnight.
adults get roughly 20-25% of their total sleep in rem. but here’s the part that most sleep tracking apps don’t really explain: rem isn’t evenly distributed through the night. it’s stacked at the end. your first sleep cycle might have 10-15 minutes of rem. your last one — the cycle that happens somewhere between hour 6 and hour 8 — might have 45-60 minutes. the longer you’ve been asleep, the longer each rem period gets.
which means if you’re cutting your sleep to 6 hours, you’re not losing rem proportionally. you’re carving off the part of the night where most of it was supposed to happen. you could be getting maybe a third of your potential rem sleep and have no idea, because the first few hours felt fine.
i know “sleep more” is the most annoying possible answer. but it’s genuinely the highest-leverage thing on this list and it doesn’t cost anything. protecting those last 60-90 minutes of sleep — not cutting them off because 7am feels like a more virtuous wake-up time than 7:45 — changed things for me faster than any supplement ever did.
what alcohol is actually doing to your sleep
this one stings a little because it’s so counterintuitive. alcohol genuinely makes you fall asleep faster. it genuinely sedates you during the first half of the night. so it really does feel like it’s helping — until you look at what’s happening in the second half.
as your body processes alcohol, usually around the 3-4 hour mark, there’s a rebound activation. your nervous system swings back. you start surfacing more. and rem — which was supposed to be ramping up right around then — gets suppressed instead. studies have found alcohol reduces rem duration by up to 25% on a given night, even with moderate amounts. one or two drinks in the evening is enough to show a measurable effect.
the really insidious part is that you don’t feel it happening. you wake up, you “slept 8 hours,” and you feel vaguely hollow in a way you can’t quite locate. that’s the rem debt. it accumulates quietly.
i’m not saying never drink. i’m saying: if you’re genuinely trying to fix your sleep quality and you’re also having a drink most evenings, those two goals are working against each other in a very specific way, and it’s worth knowing that. 
why your weekend sleep pattern matters more than you think
rem sleep is regulated partly by your circadian rhythm — the internal clock that decides when you feel awake and when you feel sleepy. and rem is particularly sensitive to disruptions in that timing. when your sleep schedule shifts around a lot, your body’s ability to sequence through sleep stages efficiently breaks down.
here’s what that looks like practically: if you normally go to bed at 11 and wake at 7, but on friday you stay up until 2am and sleep until 10, you’ve essentially given yourself jetlag without going anywhere. the rem cycles that happen at the end of your normal sleep window are now happening at a different biological time, and the quality is different. and the disruption doesn’t reset by monday morning — it can drag into the early part of the week.
the most stabilizing thing you can do is anchor your wake time. same time every morning, including weekends, give or take 30 minutes. your bedtime can shift around a bit and the system handles it okay. but the wake time is what sets your circadian clock for the next 24 hours. if you’re all over the place on that, everything downstream — including rem — gets messier. this is also the core principle behind resetting a broken sleep schedule when it’s really gone off track.
the room temperature thing
during rem sleep your body does something weird: it partially loses the ability to regulate its own temperature. you become more dependent on your environment than you are during other sleep stages. if your room is warm, your body struggles to stay in rem — the sleep gets lighter and more fragmented, you cycle out of it earlier than you should.
most sleep research points to 65-68°F (18-20°C) as the sweet spot. probably cooler than you keep your bedroom right now. i had mine at 72 for years and wondered why i kept waking up at 5am feeling weirdly alert.
the other environmental thing worth mentioning: light. the long rem periods happen in the early morning hours. light coming into your room — even filtered through curtains — triggers your brain’s waking processes earlier than your alarm. blackout curtains are one of those things that sounds trivial until you try them and realize they actually do something. the darkness protects exactly the part of the night where your best rem was supposed to happen. 
stress, cortisol, and why the loop is hard to break
high cortisol suppresses rem sleep — that’s pretty well established. chronic stress keeps the nervous system in a low-grade alert state that makes it harder to fully sequence through the deeper sleep stages. but here’s the part that makes it genuinely difficult: inadequate rem makes emotional regulation harder, which makes you more reactive to stress, which keeps cortisol elevated, which suppresses rem. the loop feeds itself.
breaking it usually requires working on both ends at once. on the sleep side: magnesium helps your nervous system downregulate — it supports GABA activity, which is basically your brain’s off switch. ashwagandha has decent evidence for reducing cortisol in people under sustained stress, which is the upstream problem. on the lifestyle side: a genuine wind-down routine — not phone in bed with brightness turned down, but actual low-stimulation time — gives the stress response a runway to settle before you’re trying to sleep.
none of this works in a week. but the nervous system does respond to consistent signals. if you’ve been stuck in a stressed, fragmented sleep pattern for months, you’re not broken — you’re calibrated to a bad environment, and recalibration takes time.
supplements worth knowing about
i want to be honest about what supplements can and can’t do here. nothing you can buy at a drugstore is going to directly manufacture rem sleep for you. what some things can do is remove obstacles — lower your body temperature at the right time, calm down a nervous system that’s running too hot, extend total sleep duration so there’s more room for rem to happen.
glycine at 3g before bed works on body temperature — it helps push heat to the periphery and drop your core temp, which is one of the actual physiological triggers for entering deeper sleep. it has more direct sleep architecture research behind it than most supplements in this category.
tart cherry juice is one of the more underrated options here. it naturally contains melatonin precursors and has a few small studies showing improvements in sleep duration and quality. longer sleep means more rem by default.
melatonin is tricky. small doses — 0.3 to 0.5mg, not the 5-10mg on most store shelves — can help with sleep timing without the rem suppression that higher doses sometimes cause. there’s some evidence that high-dose melatonin actually disrupts rem architecture. if you’re using it, go smaller than you think you need.
what to avoid: over-the-counter sleep aids built on diphenhydramine (the antihistamine in ZzzQuil, Benadryl, Unisom) suppress rem sleep significantly. you’ll knock out, but the sleep architecture is compromised. same with benzodiazepines. if you’re relying on either of these and wondering why you still feel unrefreshed — that’s probably why.
exercise: it helps, but timing matters
regular exercise improves sleep quality including rem — that part is pretty consistent across studies. the nuance is when. vigorous exercise within a couple of hours of bedtime raises core body temperature and activates your stress hormones, both of which work against the conditions rem needs. morning or afternoon exercise sidesteps this entirely and has the added benefit of reinforcing your circadian rhythm, especially if you do it outside in natural light.
if you can only exercise in the evening and you’re sleeping fine — don’t change it. the individual variation here is real and your own data matters more than the general guideline. but if you’re exercising late and sleeping poorly, it’s a reasonable variable to experiment with.
how to actually tell if your rem is improving
sleep trackers are useful but imperfect. fitbit, oura, apple watch — they estimate rem reasonably well for trend-tracking but shouldn’t be read as exact. what i’d pay more attention to is how you feel.
good rem sleep shows up as emotional steadiness — you’re not disproportionately reactive to things that wouldn’t normally bother you. memory feels more available. you wake up with some sense that your brain finished what it started overnight, even if you can’t articulate exactly what that means. and usually, more vivid or memorable dreams are a sign that rem is happening and being processed properly.
if you’re consistently waking up in the middle of the night, that’s one of the most direct ways to tank your rem — you’re constantly getting knocked out of sleep right when the long rem periods should be building. fixing the waking-up problem is often more effective than any rem-specific intervention.
one last thing: if you’ve been sleep-deprived for a while and you start sleeping properly, expect rem rebound. you’ll dream more, the dreams might feel intense or emotional, you might feel like something shifted in your sleep quality. that’s your brain making up a deficit. it’s not a problem — it’s the system working. let it run.
This article is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional before making changes to your health routine.
