What white noise actually is
White noise is a steady hiss that contains equal energy at every audible frequency — the sound of an untuned radio or a fan pushed through a synthesizer. Its superpower is masking: because it covers the whole frequency range evenly, it blurs nearly any sudden noise, from a barking dog to a slammed door.
Its weakness is the listening experience itself. To many ears, white noise sounds clinical — effective, but not something you'd choose to live inside.
What rain does differently
Rain is broadband too, but its energy is shaped: fuller in the low and middle frequencies, softer at the top, closer to what engineers call pink noise. In practice that means nearly the same masking benefit for typical household noise, delivered in a sound that feels like weather rather than equipment.
There's also the comfort factor. Sleep researchers often point out that the best sleep sound is the one you'll actually use every night, because consistency turns the sound into a cue for sleep. Most people find it far easier to build a nightly habit around a rainstorm than around static.
When white noise wins
If your nights are punctuated by sharp, high-pitched sounds — a baby's monitor crackle, a yapping dog next door, thin apartment walls — maximum broadband masking is the priority, and white noise's even spread is hard to beat. Some people also simply prefer its featurelessness: there's no weather to picture, nothing for the mind to follow.
When rain wins
For most bedrooms, most of the time, rain is the easier sound to live with. It masks doors, traffic, footsteps, and snoring almost as well as white noise, it's gentler on the ears over long sessions, and it layers naturally with other sounds when you want to shape it.
In Calming Galaxy, rain comes as a gapless recording you can mix to taste — add distant Thunder for more low-end masking weight, or soften it under Ocean Waves. The mixer's per-sound volume sliders let you approximate a denser, more broadband rain if pure rain feels too light.
How to test them properly
Don't judge a sleep sound at 10 p.m. while you're still awake and listening to it — judge it at 7 a.m. by how the night went. Give each sound a fair trial:
- One sound per week, not one per night — first impressions are unreliable.
- Same low volume each night: about as loud as a quiet conversation, or softer.
- Same sleep timer setting, so only the sound itself changes.
- Score the mornings: how fast you drifted off, how often you remember waking.
The honest bottom line
There's no objectively superior sound — there's the sound your nervous system stops noticing. White noise is the maximal masker; rain is the maximal masker most people enjoy. Start with rain for a week. If you sleep through it, you've found your answer.
Hear it for yourself
These guides are easier to act on than to read. The sounds they reference each have their own page — the ones marked Free play right there on the site.
