Brown Noise — 10 Hours

Brown Noise for 10 hours is ideal for extended sleep, all day background, continuous coverage. Ten hours is the YouTube standard - the duration that dominates ambient sound search queries.

Brown noise is named after Robert Brown and Brownian motion — not the colour. It emphasises low frequencies, losing about 6 decibels per octave as frequency rises, producing a deep, warm, enveloping sound often compared to a strong waterfall, distant thunder, or the low rumble of a jet engine from inside the cabin. Brown noise exploded on TikTok in 2022 when ADHD communities discovered that the deep, consistent sound seemed to "quiet their brains" in a way other sounds didn't. The hashtag #brownnoise accumulated over 100 million views. The theoretical basis is stochastic resonance — external noise helps understimulated brains reach optimal processing levels. While the 2024 Nigg meta-analysis found no peer-reviewed studies specifically on brown noise (all clinical evidence uses white or pink noise), the mechanism applies to broadband noise generally, and the anecdotal evidence from millions of users is overwhelmingly consistent.

Ten hours is the YouTube standard - the duration that dominates ambient sound search queries. It provides full overnight coverage with morning margin, or all-day continuous background. Same sleep timer recommendation as 8 hours: for sleep, let it fade after 45-90 minutes. For daytime use, 10 hours covers a full workday plus commute with no restarts needed.