White Noise & Sleep Sounds

White noise is a random signal that contains all audible frequencies at equal intensity — like static from an untuned radio. When played at a moderate volume during sleep, it creates a consistent acoustic "mask" that prevents sudden sounds (traffic, neighbours, notifications) from spiking above background levels and triggering arousal responses.

Research published in Sleep Medicine Reviews found that continuous white noise reduced sleep onset latency by an average of 38% in hospital environments. In home settings with typical urban noise, studies show it can reduce nighttime awakenings by masking transient sounds that would otherwise interrupt sleep cycles.

Binaural beats work by playing slightly different frequencies in each ear — the brain perceives the difference as a low-frequency pulse. For sleep, delta frequencies (0.5–4 Hz) are used to encourage the slow-wave brainwaves associated with deep, restorative sleep.

A 2020 meta-analysis in Psychological Research found that delta binaural beats significantly improved subjective sleep quality in healthy adults. However, they require stereo headphones and work best when combined with a relaxing environment — they are not a substitute for good sleep hygiene.

Important: Do not use binaural beats while driving or operating machinery. Some people with epilepsy should consult a doctor before use.

Playing ambient sound continuously all night is generally safe, but some sleep researchers recommend using a timer to allow your brain to experience natural silence during later sleep cycles when sleep is lighter. A 90-minute timer aligns with one full sleep cycle.

For most people, 30–60 minutes is sufficient — long enough to fall asleep but short enough to prevent any dependency on continuous noise. If you find yourself waking when the sound stops, try a 90-minute timer instead.