Evie Summers
White noise machines are a popular solution for those struggling to sleep due to environmental noise. By emitting a range of frequencies across the hearing spectrum at equal intensity, white noise establishes a consistent auditory backdrop that masks disruptive sounds. This helps to create a peaceful environment for better sleep. White noise machines can also produce shades of pink and brown noise, which are deeper sounds that may be more effective at blocking out certain types of noise. While the science behind how white noise improves sleep is still unclear, it has been found to help people fall asleep and stay asleep by reducing sleep disturbances caused by noise pollution.
| Characteristics | Values |
|---|---|
| Purpose | To aid sleep by blocking out disruptive environmental noises |
| Mechanism | Produces a range of sounds, including white, pink, and brown noise, that mask unwanted background noise |
| Benefits | Improved sleep quality, reduced stress, enhanced focus, improved work performance, reduced crying in infants |
| Types | Physical fan-based machines, digital sound machines, mobile apps |
| Features | Adjustable volume, sleep timers, audio output for speakers/headphones, night light |
| Examples | LectroFan EVO, Yogasleep Dohm Nova, Sound+Sleep SE, myNoise, Whish Multi-Sound Machine, Bedtime Fan, White Noise Generator |
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What You'll Learn
White noise machine recommendations
There are several white noise machines available in the market, and the right one for you will depend on your preferences. Here are some recommendations:
- LectroFan EVO: This is a popular choice, known for being the loudest white noise machine. It offers a wide variety of sounds, including white, pink, and brown noise, as well as a range of fan sounds. It is easy to use and has useful features like auto-off timers and a headphone jack. It is recommended for adults who prefer a variety of colour-based sounds.
- Yogasleep Dohm Nova: This machine is ideal for those who prefer fan-like noises. It emits a gentle, monotonous hum, with a pleasant, natural fan sound. The Dohm Nova has been a favourite for over 50 years and is known for its effectiveness in masking softer noises. However, it may require a higher volume to block out louder, more aggressive sounds.
- Sound+Sleep SE: This machine stands out for its customizable range of authentic environmental and colour-based noise variations. It offers one of the most diverse sound libraries, with 64 different sound profiles, including ambient-noise categories like a waterfall, city chatter, an ocean, and meditative music. It is a good choice if you are looking for natural soundscapes.
- Yogasleep Duet: This is a great all-round option, especially for parents. It features soothing lullabies, auto-off timers, a nightlight, and a Bluetooth speaker function.
- Snooz: This machine has an actual fan inside, providing real white noise without the cold air. It is adjustable in volume and tone and is louder than the Dohm models. It also has a companion app with features like daily timers and a nursery calibration.
- Hatch: This is a popular choice among parents, with adjustable volume and a red light feature.
- Magicteam Sound Machine: This affordable option offers 20 non-looping natural soothing sounds, 32 levels of volume, and a sleep sound timer.
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How white noise helps you sleep
White noise is a collection of sounds that have the same intensity through the audible range, creating a uniform sound that is perfect for masking loud disruptions. It contains all audible sound frequencies at the same intensity, establishing a consistent auditory backdrop that enables users to fall asleep.
White noise machines can help block out environmental or outside noises that cause disturbed sleep. They can help you get to sleep and stay asleep, and may even help train your brain to know when it's time to sleep. The steady, continuous noise blocks out other sounds, like sirens, barking dogs, or a roommate's TV. White noise can also signal to your brain that it's time to get to sleep, and once you begin using it, it can help you stay asleep by blocking out any noises or loud disruptions that may wake you up.
There are many different types of white noise machines, and they offer a range of sounds. For instance, the LectroFan EVO can produce shades of pink and brown noises as well as white noise, while the Yogasleep Dohm Nova emits a range of fan sounds. If you're looking for a machine that offers natural soundscapes, the Sound+Sleep SE excels at producing nature-like soundscapes.
If you don't want to buy a machine, there are also multiple apps you can download, including the hugely popular Bedtime Fan for Apple devices or White Noise Generator for Android.
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The science behind white noise
White noise is a specific type of broadband sound that includes all audible frequencies. It gets its name from white light, which is a combination of all colours in the visual spectrum. White noise is, therefore, an audible spectrum of all possible sounds. It is continuous and includes all frequencies across the spectrum of audible sound in equal measure.
White noise is often used to mask disruptive sounds. Our brains are primed to detect changes in sound rather than constant noise, and white noise is loud enough to drown out any potential distractions to your sleep. It is constant enough that after a few minutes, your brain starts to ignore it, and you can sleep as a result. It is also processed by the brain in the same way as other sounds, but it doesn't command the same level of attention as speech or music.
White noise is also used in healthcare settings to treat hyperacusis, a heightened sensitivity to normal environmental sounds, or to mask the annoyance caused by tinnitus. It can also be used to obscure background noises in offices.
Researchers have studied the effects of white noise on humans for many years, finding evidence that it can reduce crying in infants, improve work performance, and potentially help counteract symptoms of attention-deficit/hyperactivity disorder (ADHD). Multiple studies have also examined how white noise may affect human sleep, with mixed results. Some studies have found that white noise can help people fall asleep faster, improve sleep quality, and increase the amount of time spent asleep. However, other studies suggest that white noise can disturb a person's sleep and may affect their hearing.
In addition to white noise, there are several other colours of noise, including pink noise and brown noise, which are broadband sounds like white noise but are perceived as deeper sounds. Pink noise contains sounds within each octave, but the power of its frequencies decreases by three decibels with each higher octave, resulting in a lower pitch than white noise. Brown noise, also called red noise, contains sounds from every octave of the sound spectrum, but the power behind the frequencies decreases with each octave at twice the rate of pink noise. People have said that brown noise reminds them of the sound of rainfall or a shower.
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White noise for babies
White noise can be a great way to help your baby sleep. It refers to any noise containing many frequencies with equal intensities and can be used to block out other noises that might wake your baby. White noise machines can be particularly useful in households with multiple children of different ages, as they can help to block out the noise of older siblings.
White noise can be used at any age, but some people aim to stop using it by the time their child is 2 years old. There is no time limit, however, and it is left up to caregivers to decide when to stop using white noise. It's important to note that not all babies respond well to white noise, and they can become dependent on it to fall asleep. There are also potential risks to their hearing if the volume is too loud.
There are a variety of white noise machines available, such as the LectroFan EVO, which can produce shades of pink and brown noise in addition to white noise. The Yogasleep Dohm Nova is another popular option, emitting a range of fan sounds that can be soothing for babies. If you don't want to purchase a machine, there are also white noise apps available, such as myNoise, which offers a wide range of customizable sounds.
When using a white noise machine for your baby, it's important to keep the volume at a safe level. A study by the American Academy of Pediatrics (AAP) found that white noise machines designed for infants exceeded recommended noise limits, which could potentially damage their hearing. It's also important to remember that white noise may not work for all babies, and it could become disruptive if your baby becomes dependent on it and the machine is not available.
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White noise vs. other colours of noise
White noise is a well-known type of broadband sound that includes all audible frequencies, with each frequency produced at the same intensity level. It is often described as sounding like static or a fan, air conditioner, or vacuum. White noise is commonly used to mask background noise and help people fall asleep.
Pink noise is similar to white noise in that it is also a broadband sound that includes components from across the sound spectrum. However, the power of its frequencies decreases by three decibels with each higher octave, resulting in a lower pitch than white noise. Pink noise has been linked to improved sleep quality, particularly in older adults, as it can help individuals fall asleep faster and stay asleep longer by reducing the difference between background noise and loud, jarring noises.
Brown noise, also known as red noise, contains sounds from every octave of the sound spectrum, but the power behind the frequencies decreases at a faster rate than pink noise, resulting in a deeper and more bass-like tone. Brown noise has been shown to improve cognitive performance, enhance executive functioning, and improve working memory. While there is limited research on its effects on sleep, some people find that it helps them fall asleep and improves their sleep quality.
Green noise is a relatively new concept and is less popular than white, pink, and brown noise. It falls into the mid-range of the sound frequency spectrum, providing a reliable and calming background noise buffer that can help with relaxation, focus, and reducing symptoms of anxiety and ADHD.
Violet noise, also called purple noise, is the opposite of brown noise, with its volume increasing as the frequency increases, resulting in a higher-pitched sound. It is often used to treat tinnitus. Grey noise is similar to violet noise in that its volume also increases with frequency, but it has a more balanced sound that is smoother and more perceptually pleasing to the human ear.
While white noise is the most popular and well-known colour of noise, other colours of noise, such as pink, brown, green, violet, and grey, offer unique benefits and may be better suited to certain individuals or use cases.
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Frequently asked questions
White noise is a collection of sounds that have the same intensity through the audible range, creating a uniform sound that masks loud disruptions. It contains all audible frequencies at the same intensity, establishing a consistent auditory backdrop that enables users to sleep, study, or read.
White noise helps people get to sleep and stay asleep by blocking out outside sounds and masking disruptive sounds. It creates a buffer between outside noise and your eardrums, so you can keep sleeping peacefully. White noise can also signal to your brain that it’s time to get to sleep.
The LectroFan EVO is one of the most effective white noise machines for the price. It can produce shades of pink and brown noises in addition to white noise. The Yogasleep Dohm Nova is another top pick, emitting a range of fan sounds. For a machine that offers natural soundscapes, the Sound+Sleep SE is a good option.
