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  4. Noise and sleep: making silence in a loud world

Making silence in a loud world

Short answer

It isn't the volume of a sound that wakes you, but its sudden change. A constant background sound — white, pink or brown noise — reduces that contrast, so that a slamming door or passing car causes fewer micro-awakenings and your sleep cycles stay intact.

Contrast
It isn't volume that wakes you, but change
Micro-awakening
What masking helps prevent
Pink / brown
Softer variants many people prefer

How masking works

A constant background sound reduces the contrast between silence and a sudden noise. Your brain registers the peak less as something new and you stay in your sleep stage. That is called auditory masking.

Many people find pink noise — lower tones, like rain — or brown noise calmer than classic white noise. Don't set the source too loud: a soft, constant level is enough, and louder works against you.

Masking or blocking

With variable ambient noise — a street, a neighbour, a partner coming in later — masking usually works better than blocking. With sustained loud noise, blocking with earplugs is more effective.

The most underrated noise in a bedroom comes from inside: a ticking clock, a fridge through the wall, or a bed that creaks with every movement. That last one is one of the reasons a good bed is built so quietly.

Sources

  1. Messineo et al. (2017). Broadband sound administration improves sleep onset latency. Frontiers in Neurology.
  2. Riedy et al. (2021). Noise as a sleep aid: a systematic review. Sleep Medicine Reviews.
  3. Basner et al. (2014). Auditory and non-auditory effects of noise on health. The Lancet.

Frequently asked questions

Is white noise all night unhealthy?

At a soft level there is no indication of that. Keep it below fifty decibels — roughly the level of soft rain — and don't put the source next to your head.

Why do I wake from sounds my partner doesn't hear?

Sensitivity to noise during sleep varies strongly per person and per sleep stage. In the early morning, with more light sleep and REM, everyone becomes more sensitive — including those who call themselves heavy sleepers.