Why Sound Helps You Sleep
Silence isn't always golden when it comes to sleep. Sudden noises — a car outside, a door closing, a neighbour's TV — can jolt you out of light sleep stages. Consistent background sound masks these disruptions by raising your baseline noise floor, so sudden sounds don't stand out as sharply. This is why so many people swear by fans, air conditioners, or dedicated sound machines.
But not all background sound is the same. White noise and pink noise are the two most popular options, and they work differently.
What Is White Noise?
White noise contains equal energy across all audible frequencies — from the lowest bass rumbles to the highest treble hiss. The result is a bright, static-like sound similar to an untuned TV or a rushing air vent. It's very effective at masking sudden sounds because it covers the full frequency spectrum.
Best for: Light sleepers in noisy environments, people who need strong sound masking, office workers using it for focus.
Potential downside: Some people find white noise harsh or fatiguing over time, especially at higher volumes.
What Is Pink Noise?
Pink noise has more energy in the lower frequencies and less in the higher ones. The result is a warmer, deeper sound — think steady rainfall, rustling leaves, or ocean waves. It's often described as more natural and soothing than white noise.
Research suggests pink noise may also support deeper sleep. A small study published in Frontiers in Human Neuroscience found that pink noise synchronised with slow-wave brain activity improved memory consolidation during sleep.
Best for: People who find white noise too harsh, those who prefer natural soundscapes, anyone looking to support deeper sleep stages.
Other Noise Colours Worth Knowing
Brown noise goes even deeper than pink — a low, rumbling sound like a strong wind or distant thunder. Many people find it the most relaxing of all. Green noise is centred around mid-frequencies and mimics the ambient sound of nature. Both are worth experimenting with if white and pink don't feel right.
Which Should You Choose?
There's no universal winner — it comes down to personal preference and your sleep environment. A good rule of thumb: if you live in a loud urban area and need strong masking, start with white noise. If you find that too harsh or you're looking for something more calming, try pink or brown noise.
The best approach is to experiment. Most quality sound machines offer multiple noise types so you can find what works for your ears and your environment.
Tips for Using Sound for Sleep
- Keep volume at a comfortable level — around 50–65 dB is generally recommended (roughly the level of a quiet conversation).
- Use a timer if you prefer silence once you're deeply asleep, or run it all night for consistent masking.
- Pair sound with other sleep hygiene habits: a dark room, a cool temperature, and a consistent bedtime.
- A quality sleep mask alongside your sound machine creates a complete sensory sleep environment. The Sleep Band Ultra pairs well for full blackout coverage.
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