Brown Noise During Pregnancy: Is It Safe and Can It Help You Sleep?

Pregnancy and sleep have a complicated relationship. The hormonal changes, the physical discomfort, the racing thoughts about everything that needs to happen — it adds up to a lot of nights where falling asleep takes much longer than it should.

Brown noise is one of the most pregnancy-friendly sleep tools available. It's free, non-pharmacological, has no known risks for you or the baby, and works particularly well for the specific kind of insomnia pregnancy brings.

Is it safe during pregnancy?

Yes. Brown noise is just ambient sound — there's no risk to pregnancy at any stage. Your baby is well-protected from external sound by the amniotic fluid and your body's natural sound dampening. Even at the volume you're listening to, the baby experiences brown noise as a much quieter, muffled version.

In fact, your baby is already swimming in a sound environment that's surprisingly similar to brown noise. The womb has constant low-frequency sounds — your blood flow, heartbeat, digestion, breathing. The frequency profile is heavily weighted toward low frequencies, which is exactly what brown noise mimics.

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Why pregnancy makes sleep harder (and how brown noise helps)

Several pregnancy changes specifically interfere with sleep:

Heightened sensitivity to sound. Hormonal changes in pregnancy can make you more sensitive to ambient sound. Things that wouldn't have woken you before do now. Brown noise raises the baseline noise floor, which reduces how much contrast there is between silence and sudden sounds.

Racing thoughts. Pregnancy comes with a lot of mental load — practical planning, anxiety about the unknown, processing the magnitude of what's coming. Brown noise's heavy, immersive character is particularly effective at quieting this kind of mental activity.

Physical discomfort interrupting sleep. As pregnancy progresses, finding comfortable positions becomes harder. When you do shift, surface, or change position in the night, brown noise helps you fall back asleep faster by maintaining the continuous sound environment your brain was sleeping to.

Restless legs and other physical sleep disruptors. These don't go away with brown noise, but the masking effect reduces how easily small disturbances escalate to full wakefulness.

Practical use through each trimester

First trimester. Often the worst for fatigue and unexpected exhaustion. Brown noise during the day for naps is just as useful as at night. Many pregnant women find a 30-minute brown noise session in the afternoon is more restorative than trying to push through.

Second trimester. Usually the most stable sleep period. This is a good time to establish the brown noise habit if you haven't already — your brain will form a clear association between the sound and sleep, which becomes useful when third-trimester sleep gets harder.

Third trimester. Sleep is genuinely difficult. Brown noise becomes most valuable here. The combination of physical discomfort, anxiety, hormonal changes, and reduced ability to find comfortable positions means you need every sleep advantage you can get. Many women find brown noise played all night through a small speaker is the difference between fragmented and adequate sleep.

Volume and setup recommendations

For yourself: 45–55dB at pillow level. This is roughly the volume of quiet conversation. Use a small Bluetooth speaker beside the bed rather than earbuds — much more comfortable for sleep, especially as pregnancy progresses.

You don't need to worry about the baby's exposure if you're using normal listening volumes for yourself. The combination of distance, amniotic fluid, and natural sound dampening means the baby experiences brown noise at low, muffled levels — comparable to the constant sound environment they're already in.

For postnatal use, see white noise for babies for specific guidance on safe levels and positioning once the baby arrives.

Other noise colours worth knowing about

Brown noise tends to work best for pregnancy sleep, but if you don't get on with it:

Pink noise is gentler and more rain-like. Some pregnant women find brown noise too heavy or immersive and prefer pink noise's lighter touch.

Green noise is mid-frequency and nature-like. If pregnancy anxiety is your main issue, green noise has a calming quality that may suit you better than brown.

White noise is more clinical-sounding but is the most studied. If you're going to continue using a noise machine after the baby arrives, white noise is the most established for infants — it might be worth getting used to it during pregnancy.

Setting up a system that works

The setup that tends to work for pregnant women through to delivery:

A small Bluetooth speaker on the bedside table. Brown noise played continuously from a phone or laptop in airplane mode (to avoid notifications). Volume at 45–55dB, checked once with a free app. A sleep timer is generally not necessary during pregnancy — running it all night through the difficult sleep periods is usually preferable to having it stop.

If you're using your phone, set it to Do Not Disturb so notifications don't interrupt the audio. The whole point of brown noise is consistent background sound, which gets defeated by random message pings.

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