Rain and Brown Noise for Deep Sleep
Brown noise covers the traffic and the boiler, and rain softens the sharper sounds inside the room.
- Brown Noise 65%
- Rain 38%
6 Best Sounds for Deep Sleep: A Practical Comparison
Brown noise is the best sound to try first for deep sleep, because it is a deep rumble and a rumble is what covers traffic, pipes and a boiler coming on. Steady rain is mostly hiss, so it does more for voices, doors and footsteps, and pink noise is the softer option if white noise wears on you. None of them has been shown to give you more deep sleep. What a steady sound does is take the edge off the noises that would otherwise pull you awake.
Slo plays all of these free in your browser at slonoise.com, with a timer if you’d like them to stop before morning. Press play on brown noise tonight, or open the rain and brown noise mix when one sound still leaves gaps.
This page covers staying asleep: the door or the engine that wakes you at two in the morning. If you are choosing a sound to fall asleep to, or wondering which color of noise to start with, read best sounds for sleep first.
Best sounds for deep sleep at a glance
| Sound | Best for | Main drawback | Listen |
|---|---|---|---|
| Brown noise | Traffic, pipes, a boiler | A phone speaker cannot play it properly | |
| Steady rain | Voices, doors, steps, a running faucet | Drips or thunder can start to stand out | |
| Pink noise | A softer background than white noise | The lab studies used timed bursts, not a steady track | |
| Fan sound | A familiar sound you stop noticing | Does less for a deep rumble than brown noise | |
| Ocean waves | People who like a sound that rises and falls | A single wave can wake a light sleeper | |
| Quiet forest ambience | A room that feels too bare | Birds and insects can catch your ear |
What a sleep sound can and cannot do
Your ears keep working while you sleep. A door, an engine or a voice can pull you part of the way awake without you remembering it in the morning. A steady sound already running in the room gives that noise less to stand out against, so it is less likely to reach you.
It’s fair to expect a sound to cover noise. It isn’t fair to expect it to give you more deep sleep. Riedy and colleagues went through the research on steady noise as a sleep aid and found it weak and mixed, with some studies pointing to worse sleep.
The pink noise headlines come from a different setup. In small lab studies, researchers played very short bursts of pink noise timed to the slow brain waves of deep sleep. A recording playing steadily from your phone does not do that, so it cannot borrow the result.
1. Brown noise
Brown noise is a deep, soft rumble. It covers traffic through the wall, water in the pipes and the boiler starting up, and it does that without the bright hiss of white noise.
Choose it when: the noise that wakes you is a deep one, or white noise sounds too sharp to you.
Skip it when: you are playing it from a phone speaker, which is too small to produce deep sound and turns the rumble into a thin pulse. Earbuds you can lie on fix that, and so does rain or pink noise, which come through a small speaker more evenly.
Brown noise is a practical way to cover noise. It has not been shown to give you more deep sleep. Read what brown-noise research can actually show.
2. Steady rain
Rain is mostly hiss, with enough small changes in it that it never sounds flat. That suits a room where different things wake you on different nights, because the hiss softens a door, a voice or a faucet running upstairs. A deep rumble from the street still comes through it.
If you want rain and a rumble together, open rain sounds for sleeping, which starts with rain over a quieter brown noise and a 45-minute timer already set.
Choose it when: you prefer a natural sound, or the thing that wakes you is higher-pitched than a rumble, like steps in the hall or a voice through the wall.
Skip it when: the recording has clear drips, thunder or a loop you can hear repeating. Once you notice one of those, it becomes the sound keeping you awake.
3. Pink noise
Pink noise is a softer hiss than white noise, close to rain heard from indoors. It is the gentler of the two if white noise sounds harsh to you.
Choose it when: white noise tires you out but brown noise sounds too deep.
Skip it when: you are picking it only because a headline says pink noise increases deep sleep. Those studies used short bursts timed to the brain in a lab, and nobody has shown the same thing from a recording playing all night.
4. Fan sound
A fan is a steady, familiar sound, and most people stop hearing it within a few nights. A real fan moves air as well, which helps in a warm room. Every fan sounds a little different, so a fan recording is not one fixed sound the way brown noise is.
Choose it when: you want the same plain sound every night and do not want to fiddle with it.
Skip it when: the fan rattles, or the motor changes pitch as it turns, and you keep listening for it.
5. Ocean waves
Ocean recordings rise and fall slowly, and some people settle better with that than with an even sound. There is more going on in them than in rain or a noise color.
Choose them when: the movement feels comforting and no single wave wakes you.
Skip them when: you find yourself waiting for the next wave. Steady rain or a stream sits more quietly in the background.
6. Quiet forest ambience
A forest recording can hold wind, leaves, water, birds and insects all at once. It makes a bare room feel warmer, though any one of those sounds can be the thing that catches your ear in the night.
Choose it when: a plain noise color feels unpleasant to you and you already sleep well with a window open.
Skip it when: a close bird or a cracking branch stands out. A plain forest recording works better at night than a busy, film-like one.
Choose by the noise that wakes you
| Nighttime problem | First sound to test | Why |
|---|---|---|
| Low traffic or a boiler | Brown noise | A deep rumble covers a deep rumble |
| Voices or steps in the hall | Rain or pink noise | Hiss blurs voices better than a rumble does |
| Something different every night | Steady rain | Broad hiss that keeps changing a little |
| A room that feels too silent | Fan or pink noise | Plain and even, nothing to follow |
| Hiss and rumble both annoy you | Quiet rain or a stream | Water moves, and there are no voices in it |
No sound will soundproof a room. Close the window first, and if the noise comes from one direction, put the speaker between you and it. Fix what you can fix before you turn anything up.
A safe three-night test
Use the same sound for three nights before deciding whether it belongs in your routine.
- Start at the lowest level you can hear, then raise it only until the noise stops standing out.
- Keep the speaker away from your head, and make sure you can still hear your alarm, the smoke detector and your children.
- In the morning, note whether you remember waking, and whether the sound itself started to annoy you.
- Try one similar night with no sound at all, so you have something to compare.
The number on your volume slider does not tell you how loud the room is; that depends on the speaker, how far away it is and the room itself. The World Health Organization advises adults using headphones or earbuds to keep the average below 80 decibels, and to listen for less time as the level goes up. A sound that you can only just hear over the room is far quieter than that. Turn it down or off if you notice ringing, muffled hearing or pain in your ears.
Sound is not a treatment for insomnia, sleep apnea, persistent daytime sleepiness, or another sleep disorder. Seek qualified care when sleep problems continue, affect daily life, or include breathing pauses and loud snoring.
Sleep presets
Compare a steady base with natural movement
The browser presets provide adjustable starting balances. Keep the quieter version, and remove any layer that attracts attention.
Ocean and Pink Noise for Restful Sleep
Pink noise runs steady while the waves rise and fall over it, for nights when the room feels too quiet.
- Pink Noise 62%
- Ocean Waves 36%
Frequently asked questions
What is the best sound for deep sleep?
Brown noise is the one to try first if a rumble is what wakes you: traffic, pipes, the boiler. Rain covers more of the middle range, and pink noise is lighter than both. No recording has been shown to give you more deep sleep.
What is the best color noise for deep sleep?
Brown noise rumbles and pink noise is a soft hiss, so most people find both easier to leave on all night than white noise. Which one you like is a matter of taste, not of sleep stages. Listen to both before you settle on a color of noise.
Is brown noise or pink noise better for sleep?
Brown noise is the deeper of the two, and it suits traffic or a boiler. Pink noise is softer, and it comes through a small speaker better. Pick by the noise you are covering and by which one you can stand for eight hours.
What is the best sound to fall asleep to?
Rain or a fan is usually the easier thing to fall asleep to, because the house is still awake and those sounds soften voices, steps and doors. The low noises are the ones that wake you later in the night, which is where brown noise earns its place.
Does pink noise increase deep sleep?
Small lab studies played very short bursts of pink noise timed to the slow brain waves of deep sleep, and saw an effect. A recording playing steadily from your phone does not do that, so it cannot claim the same result.
Should sleep sounds play all night?
Only if the noise lasts all night and the sound stays quiet enough to be comfortable. If you only need help getting to sleep, a 30 or 60 minute timer is enough. If the sound stopping wakes you up, leave it on all night at a lower level.
How loud should sleep sounds be?
Use the lowest level that takes the edge off the noise you are covering. Keep your alarm audible, and keep the speaker or phone away from your pillow. The number on the volume slider does not tell you how loud the room is.
Research referenced
- Riedy and colleagues (2021), Noise as a sleep aid: A systematic review.
- Ngo and colleagues (2013), Auditory Closed-Loop Stimulation of the Sleep Slow Oscillation Enhances Memory.
- Henin and colleagues (2019), Closed-Loop Acoustic Stimulation Enhances Sleep Oscillations But Not Memory Performance.
- World Health Organization (2026), Deafness and hearing loss: Safe listening.
Presets that skip the setup
Each of these opens with the volumes and the sleep timer already set.
- Rain sounds for sleeping — rain 55, brown noise 25, 45-minute timer.
- Brown noise for sleep — brown noise 50, all night, for traffic and rumble.
- Pink noise for sleep — pink noise 50, all night, the softer middle option.
- Ocean sounds for sleeping — ocean 60 with pink noise 20 filling the troughs.
Related guides
- Best Sounds for Sleep
- Brown, White, and Pink Noise Compared
- How Sound Affects Sleep Quality
- How to Create a Sleep Soundscape
- Best Sleep Sound Apps in 2026
Want more to choose from? The Slo app has a larger library, saved mixes and the same sleep timers.
Explore more sounds in Slo
Stack two or three sounds, keep the blend, and let the timer stop it. Slo, on iOS, Android and Mac.
