Pink Noise: What Is It & How Does It Promote Better Sleep?

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You might have heard the terms pink and white noise, even brown noise before but what does this actually mean? When did noise sounds start being associated with colours anyway and how is this relevant to your little one's sleep? It’s actually pretty fascinating and knowing about it in more detail, might just set you up for a more successful sleep situation for you and bub and decide if it’s something you really need. Let’s jump in and ride some sound waves shall we?
Love To Dream
4 min read |
08 May, 2025

What Is Pink Noise?

To understand pink noise, it helps to know first that sound is essentially vibrations These vibrations can be categorised into speeds i.e. fast or slow and how fast they move is called the frequency.

Low frequencies are slow vibrations, like a deep rumble or thunder. High frequencies are fast, like a whistle or a bird chirping.

Pink noise is a mix of both, but it leans more toward the lower, deeper sounds. That’s why it feels softer, more natural, and less sharp - kind of like an air conditioner, rhythmic heartbeat or the whooshing sounds babies hear in the womb.

How this applies to baby sleep is that it’s believed that pink and white noise could improve sleep by creating a consistent sound environment. These noise sounds can reduce the contrast between background noise and any sudden loud noises, like doors closing or excitable toddlers playing in the other room (one can dream anyway!), therefore offering your little one a chance at an uninterrupted snooze. 

Also as a rhythmic heartbeat or a whooshing sound of the womb falls into a pink noise category, it can be assumed that the familiarity of their previous home can ease the transition to world-side and make for a more restful sleep. Is that not just the sweetest?! 

Examples Of Pink Noise Sounds

Some other examples of sounds that fall into the pink noise category are: 

  • Steady Rainfall
  • Ocean Waves
  • Rustling Leaves
  • Wind 
  • A rhythmic heartbeat
  • River Flow

There is a bit of a natural-esque pattern forming here! 

Test out your preferred examples of white, pink and brown noise

The Science Behind How Pink Noise Helps Babies Sleep

One of the biggest benefits to pink noise is how it helps create a consistent sound environment to soften the unexpected disruption of any household or unexpected noises. As pink noise contains a wide range of frequencies at a balanced level, it reduces the contrast between background noise and any sudden loud noises, giving the baby the opportunity to fall asleep and stay asleep, without being interrupted. 

The sound of a rhythmic heartbeat is also considered to be classified as “pink noise” so it’s hypothesised that this sound is familiar to the noises from inside the womb which can help calm a baby's nervous system and promote deeper sleep cycles. 

So if we are thinking of pink noise like an “auditory blanket” it can be a very useful step in your sleep routine to encourage better sleep quality for your baby. 

Is Pink Noise Safe For Babies?

The volume is important but yes, pink noise is safe for babies - you just want to make sure you follow some guidelines:  

  • Aim to keep your noise machine at least two metres away from your baby’s sleep space.    
  • Ensure the sound level never exceeds 50 decibels (no louder than a quiet conversation or a shower running). 
  • Always make sure the noise machine is out of your child’s reach and any cords are safely tucked away.  

Pink Noise Vs White Noise

The difference between pink and white noise is the power of the frequencies. White noise contains all audible frequencies (from low to high) at equal intensities or power levels.  Pink noise also contains all audible frequencies, but the intensity decreases as the frequency increases. 

This means the lower frequencies have more energy than the higher frequencies., resulting in a more natural, soothing and less abrasive sound than white noise. 

Learn More: White Noise and How to Use it 

Pink Noise Vs Brown Noise

Brown noise (also known as Brownian noise or red noise) also contains all audible frequencies, but the intensity decreases even more as the frequency increases.. This means it has a significantly greater concentration of energy in the lower frequencies compared to pink noise, resulting in a much much deeper, heavy sound, like thunder rolling for example. 

Ultimately, the colour you choose really comes down to sound preference or what your baby responds best to as the research on the effectiveness is ongoing. Some babies may prefer the static of white noise or the deeper rumblings of brown. That was one of the decisions behind designing our sleep machine which has options for each or, you could even record your very own version of a lullaby. Nothing guaranteed to soothe more than a parent's voice after all. 

Tips On Using Pink Noise Machines for Baby Sleep

Here are some helpful tips on getting started with pink noise: 

Start Early
Packing a white noise machine in your hospital bag can be a really helpful hack to combat all of the standard hospital noises and introduces a familiar sound from day one.
Pick the right sound machine
Look for quality features like a good battery life, volume and duration control, portability, a mix of colour sounds and ideally has a night light that can help navigate those late night feeds. If you want something really above the average though, something with bluetooth so you can play your own sounds via your phone and a recordable option can really elevate the value and usability of a sound machine. 
Keep the Volume Baby-Safe
Think gentle and quiet, roughly 40–50 Decibels near a cot. Using a decibel checker online is a great idea to give you peace of mind
Watch How Your Baby Reacts
Most babies love pink noise, it can be super calming but every baby is different. If your little one seems unsettled or fussy with it, try tweaking the volume, moving it farther away or trying a different colour sound to see if they respond differently.
Be Consistent
Use pink noise for all sleep times (naps and nighttime) so it becomes a familiar cue that it's time to rest. Turn it on a few minutes before you start your wind-down routine so it can act like your baby’s gentle nudge that sleepy time is coming.
Trust Your Parent intuition
You know your baby best. If pink or white noise seems to help - awesome. If not, you’re not doing anything wrong! If you ever have any concerns about your baby or sleep we always recommend reaching out to your pediatrician or a sleep consultant if you’re feeling stuck.

Can You Leave Pink Noise On All Night?

Yes you can although most advice suggests turning it off around 1-2 hours after falling asleep. Sound Machines that have timers or can run continuously are ideal as you can then determine what works best for you. 

Pink Noise & Baby Sleepwear: A Perfect Match

Sometimes babies just do the baby thing and no matter what you try, they just aren’t having a bar of whatever sleep support you are serving. What can sometimes help is having a few simple steps that form a sleep rhythm or routine that works for your family to fall back on when they are ready to try again. Having a repetitive routine can help your baby start to familiarise with the cues for sleep and get them set up for the best chance at a good sleep. A better sleep for them should (hopefully!) mean a better sleep for you too. 

Here are our top tips for setting up a great sleep environment 

  • Ensure you follow safe sleep guidelines when setting up a sleep space for comfort and peace of mind
  • Soft, breathable and comfortable swaddles or sleep bags. An easy to use swaddle or transition bag can make nappy changes and routines easy to maintain but also, they feel the same every time so it can be a strong cue for babies that swaddling = sleep time. 
  • Setting up a sleep machine that plays pink noise or any sound to suit your preference. You could also record your own shhh sounds for the best of both worlds so the baby can still hear and feel comforted by having you “nearby”. 

A quality layer close to skin to keep them warm and at optimal temperature but always follow a tog guide for layering advice.

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