Sleep sounds work through a mechanism called auditory masking: continuous background noise reduces the contrast between ambient silence and sudden sounds (traffic, voices, doors). Your brain is wired to respond to sudden changes — not to steady sound. By creating a constant sound floor, noise generators prevent these sudden contrasts from triggering brief micro-arousals that fragment your sleep.
White noise contains equal energy at all frequencies and is the most effective auditory masker. Brown noise has more power in lower frequencies, creating a deeper rumble that many find more pleasant for sustained listening. Pink noise falls between the two and has a particularly interesting property: Bhatt et al. (2017, Frontiers in Human Neuroscience) and Zhou et al. (2012, Neuron) both found that pink noise synchronized with slow oscillations during NREM sleep enhanced slow-wave activity and significantly improved declarative memory consolidation the following day (27% improvement in word-pair recall in the Zhou study). Rain is generated here by layering pink and brown noise with amplitude variation — the stochastic familiarity is also psychologically grounding for many people.
All sounds on Breathub are generated directly in your browser using the Web Audio API. Nothing is downloaded. Nothing is streamed. Just pure, free, privacy-respecting sound.
Set the volume to a comfortable level — loud enough to mask environmental sounds but not so loud it becomes another distraction. Research suggests 50–65 decibels is optimal, roughly the volume of a quiet conversation. Use the auto-stop timer if you prefer not to have sound playing all night; 30–60 minutes is typically enough to get through light sleep onset.
All sounds on Breathub are generated entirely in your browser using the Web Audio API. No files are downloaded, no audio is streamed, and nothing leaves your device. Each session generates a fresh randomised buffer, so you never hear the same pattern twice.