The sound of neighbours laughing late into the night, music playing from across the hall, a buzzing phone on the bedside table, a television left on—there are an array of everyday noises that can cause trouble sleeping. Perfect silence isn’t always necessary, or even desirable, for your best night’s sleep. In fact, some sounds at night can enhance sleep, while others - like a child crying or a smoke alarm – are important to wake up to.
When it comes to noise and sleep, the goal is to protect against unwanted and disruptive sounds, the intrusive noise that interferes with sleep’s regular routine.
Waking from noise
Noise tends to be most disruptive in the light stages of sleep, which occur at the beginning of the night and in recurring periods throughout the night. It’s also possible for noises to rouse you from deep sleep and REM sleep. To get a full night’s sleep, it is important to protect your sleep environment against unwanted noise for the duration of your night’s rest.
Noise at night can prevent you from falling asleep initially, and sounds during the night can cause trouble sleeping.
Even noises that don’t wake you can have a detrimental effect on sleep quality. The sleeping brain continues to register and process sound. Noises can create restlessness in sleep even if they don’t wake you fully, and these interruptions affect sleep quality and the movement from lighter to deeper stages of sleep.
The brain’s response to Noise
Individual responses to noise can vary significantly.
Brains that generate higher concentrations of sleep spindles—bursts of high-frequency brain waves—have demonstrated greater resistance to noise during sleep. Sleep spindles first occur during Stage 2 sleep, a phase of light sleep that composes nearly half of a typical night’s rest.1
Sleep amid ordinary sounds
Familiar sounds tend to be less disruptive to sleep than new or unusual sounds. The sounds that occur regularly in our daily lives are ones that we give little attention, and don’t create bother.2
People in cities fall to sleep with sounds of traffic every night—the same sounds that would likely keep rural dwellers wide awake. The absence of these sounds can make sleep harder.
Reactions to sounds during sleep can be influenced by meaning and significance. Sounds indicating possible danger—even very quiet sounds, like the opening of a door—often will easily wake a sleeping person. Hearing their children cry usually causes parents to wake almost instantly. These responses to noise are highly individual, and a sign of how deeply engaged the brain remains to external stimuli during sleep.
How to sleep in quiet
As with all aspects of sleep, protecting against noise gets easier with a little bit of planning. If sound interferes with your sleep at night, there are adjustments you can make to reduce and regulate noise in your bedroom:
- Carpets and floor coverings, along with curtains on the windows can help muffle noise from outside, and from other areas of the house.
- Keeping windows closed also will limit noise from outside. Be sure to turn off all electronics before you turn in for the night.
- White noise can help to block variable noises and provides constant, soothing sounds that can help you fall asleep and stay asleep throughout the night. White noise machines are designed for this purpose. Radio static, a running fan or an air conditioner can also provide this kind of mixed-frequency, pattern-less noise.
- Some people prefer familiar sounds, often from nature, such as breaking waves, crickets softly chirping, or wind rustling through leaves. Sound machines, CDs, and smartphone apps can provide these types of relaxing sound patterns to accompany you to sleep.
- When you can’t completely control the sounds around you, earplugs can help. Earplugs are comfortable and affordable way to limit noise disruption. When selecting earplugs, make sure they’re soft and flexible. Earplugs are rated at decibel levels. Be sure to select earplugs that rated at no higher than 32 decibels. These will block noise but still allow you to hear sounds that are important, such as a child crying, or your morning alarm.
Watch for noisy mornings
Don’t forget to consider sounds of the early morning, especially if you’re having trouble sleeping past a certain time. A newspaper delivery, early traffic, neighbour’s dog can disrupt sleep and shorten overall sleep time. In addition to making sure your sleep environment is quiet at bedtime, it also helps to protect against the intrusion of these early-morning noises.
Noise can undermine sleep, but it doesn’t have to. Being aware of the noise-related disruptions to your sleep environment—and taking simple steps to reduce unwanted noise—will make your nightly rest more peaceful and rewarding.
Being aware of the effects of noise on your sleeping brain can help you deal with having trouble sleeping. For a comprehensive guide to improving your sleep, download “Unlocking the Pillars of Health” eBook. By taking time to ensure that your sleeping environment is optimised for sleep, you’re already on your way to protecting and improving your nightly rest.
- Brain waves control the impact of noise on sleep. University of Liège: https://www.sciencedaily.com/releases/2011/09/110906121014.htm
- Autonomic Arousals Related to Traffic Noise during Sleep. Sleep Research Society: http://www.journalsleep.org/ViewAbstract.aspx?pid=27123
- Night Noise: What a Sleeping Brain Hears. Scientific American: https://blogs.scientificamerican.com/mind-guest-blog/night-noise-what-a-sleeping-brain-hears/