White noise has equal energy across frequencies and sounds like hiss. Pink noise has less energy at high frequencies and sounds like steady rain. Brown noise is deeper still, like a low rumble. All of them mask sudden sounds such as traffic or snoring; which works best is personal. Keep the volume moderate and the machine away from your head.
A steady sound covers the sudden noises that wake you.
Noise colors compared
| Type | Sounds like | Often preferred by |
|---|---|---|
| White | TV static, hiss | People masking high-pitched sounds |
| Pink | Steady rain, wind | Many sleepers find it softer |
| Brown | Low rumble, waterfall | People who find white noise harsh |
Choosing a machine
- Sound options and quality.
- Volume range, including very low.
- Timer or continuous play.
- Night light or no light at all.
- Power: plug-in or battery for travel.
Placement and volume
Place it a few feet away, between you and the noise source. Keep it at a comfortable, moderate level.
For light, see sunrise alarms in sleep tech. Sharing a bed with a snorer? Read mattresses for couples.
Common questions
Is it safe to use white noise all night?
At moderate volume, many people use it nightly. For babies, keep the machine away from the crib and the volume low.
Fan-based or digital machine?
Fan-based machines make real airflow sound; digital machines offer more sounds, timers and volume control.
Can I just use my phone?
Yes, but a dedicated machine keeps your phone out of the bedroom and avoids notifications.