Sleep issues now rank among the top 10 global health concerns. In response, we turn to a wide range of solutions—from drugs and supplements to habit-based strategies like reducing screen time, building a wind-down routine, lowering room temperature, and using sound-based sleep aids. Many of these methods are supported by both theory and research. Yet key questions remain: How do sounds influence sleep? Which types of noise can truly support better rest? And where do popular wellness trends diverge from what evidence actually shows?
As we’ll see, some answers may surprise you.
How Sleep Works
To understand why sound can affect sleep quality (or can not), we need to first understand how sound can affect sleep at each stage. There are four brief stages of sleep.
Stage 1 (N1): The “falling asleep” phase. The brain produces Alpha and Theta waves. You are very easy to wake; a floorboard creak can easily wake you up.
Stage 2 (N2): Light sleep. Your heart rate slows, and the brain produces “sleep spindles”–those brief bursts of activity that help you ignore outside noise. This is where sound masking is most helpful.
Stage 3 (N3): Deep Sleep or Delta sleep. The brain produces slow, delta waves to help with restoration. It’s hard to wake someone here, but if a noise is loud enough to do it, you’ll feel “sleep drunk” and groggy.
REM (Rapid Eye Movement): The dreaming stage. Brain activity looks similar to being awake. While you’re “paralyzed” during REM, your brain is still highly reactive to external sounds, which can appear in your dreams.
Why Sound Can “Mask” Distractions
And sound, in general, can affect sleep through two primary qualities. First and foremost, it is the amplitude (volume). During sleep, we are not easily awakened by just any sound; what actually wakes you up is the change in noise, that sudden sound breaks the acoustic environment. That startle effect can activate the sympathetic nervous system, which is in charge of alarming us to danger. Therefore, a silent room makes a dripping faucet sound like a drum solo, but if there is constant background noise, even a few steps outside the window would not easily startle you that much.
Second, the frequency (pitch). Higher frequencies tend to be more disruptive, while lower, rhythmic frequencies can encourage brainwave entrainment, where the neural activity mimics the steady, predictable pace of the sound, and finds it easier to maintain the slow-frequency waves needed for deep sleep.
Therefore, the reason we incorporate sound to aid sleep, aside from wellness marketing, is sound masking. Imagine a dark room where someone flips a flashlight on and off. You’ll notice every flash. Now, imagine a brightly lit room where that same flashlight is flipped on and off; you likely won’t notice it at all. Constant, predictable noises may act as that “brightly lit room.” The wide-spectrum wall of sound they created can reduce the signal-to-noise ratio of sudden disturbances.
White Noise: Not Really
While this is usually a “wait, what?!” moment, white noise’s wellness marketing crown has already slipped. White noise is a type of sound that contains all audible frequencies, each played at a constant, equal volume. Because of this sonic property, it usually sounds like “shhh”, an untuned radio, or a whirring fan, and effectively drowns out high-pitched distractions like sirens or voices.
It was once widely believed to improve sleep quality because it can raise the “noise floor” of the room. However, a 2021 systematic review on noise used in bedrooms only found very weak evidence that white noise can actually benefit sleep. If you still want to try white noise, treat it as a personal experiment, and don’t gaslight yourself if it doesn’t help. Many wellness trends may work largely through the Barnum effect and the placebo effect–something worth keeping in mind when evaluating their supposed benefits.
Pink Noise: Latest Update Says Otherwise
Like white noise, pink noise also contains all frequencies, but the higher ones are dialed down while the lower ones are boosted. It may sound like steady rainfall, wind rustling through leaves, or a muffled waterfall. One of the commonly known properties of pink noise is that it can synchronize with brain waves, potentially extending the time you spend in slow-wave (deep) sleep.
However, a 2026 study on pink noise by the University of Pennsylvania Perelman School of Medicine points out its risks as a sleep aid because it disrupts REM sleep. The REM stage is crucial for memory consolidation and emotional regulation; the disruption is particularly harmful for children whose brains are developing and spend more of their sleep in this stage. Additionally, a 2023 article suggests that overnight exposure to pink noise as a sleep aid might eventually harm thinking and creativity because it alters the necessary sleep structure. These are something worth considering if you are team pink noise.
Brown Noise: The Warm Rumble
Brown noise (sometimes called Red noise) is now the “go-to” for anyone dealing with anxiety, a busy mind, or a dislike of piercing sounds. This type of noise goes deeper into the bass and has much more energy at lower frequencies. It sounds like a deep, powerful rumble, a low roar, or distant thunder.
Because of this signature “warmth” and acoustic weight, many people find that brown noise can effectively ground them and calm the nervous system. And for neurodivergent people (including those with ADHD), brown noise is highly recommended to play as an acoustic background while working or studying.
Green Noise: The Natural Healer
Green noise is a newer term in the sleep world. It masks distractions by focusing on mid-range frequencies, specifically around 500 Hz. It sounds like “all-natural”: babbling brook, rustling leaves, constant yet gentle rain…
Because it mimics the natural frequency of the environment, it might be an optimum choice for those who find comfort more specifically in an outdoor vibe.
Tips for Sound Sleep-Aid Success
While what to listen to is important, how to listen weighs equally in a sonic sleep-aid.
Commonly, it is recommended to keep the volume moderate. To protect your hearing, keep the volume around 50–60 dB (the level of a quiet conversation). Choose a good distance. Place the speaker a few feet away from your head rather than right next to your pillow. And setting a comfortable duration is also reportedly affecting the outcome. It is a personal preference: While some people prefer to use a “fade out” timer, others find a continuous loop helps more.
Editor: I hear you, I can not sleep with the sound either
Seriously, I hear you. The purpose of this article is to provide clear, practical information, not to promote sound-sleep-aid as a “2026 viral must-have”. Personally, I prefer a wind-down routine with guided meditations paired with soothing sonic backgrounds, such as natural sounds (flowing water) or ambient music, and wear earplugs for sleep. But this kind of habit is highly personal, to say the least.
That means what works for someone else might not work for you in the same way. Experiment, listen closely, and ultimately, trust your own body more than the trend.
*Disclaimer: This article is for informational purposes only and is not intended to give medical advice. If you are experiencing sleep issues, please reach out for professional help. Always prioritize your wellbeing.*
