Pink noise
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0Pink noise
"Pink Noise" is synthesised noise whose power decreases with frequency by 3 dB per octave. Energy is evenly distributed not across frequencies (as in white) but across octaves, which matches how the human ear naturally perceives sound. Pink noise therefore feels "warmer" and "fuller" than white: less "hiss" in the highs, more "rumble" in the lows.
This is arguably the most scientifically studied sound for improving sleep. Zhou and colleagues (Frontiers in Human Neuroscience, 2012) showed that listening to pink noise during sleep increases the density of slow delta waves in N3 — directly deepening restorative sleep. The later work by Papalambros and colleagues (Frontiers in Human Neuroscience, 2017) showed that in older adults, pink noise synchronised with one's own slow brain waves improves overnight memory consolidation by ~30% versus control. One of the strongest non-pharmacological sleep effects known to modern science.
Spectrally, pink noise also appears in nature: steady waterfall noise, wind in leaves, coastal surf — all spectrally close to pink. Use this track for sleep (especially for those who can't handle the harshness of white noise), for daytime 20-minute power naps, for focused work (especially long sessions — programming, academic writing), to mask neighbour noise, for people with tinnitus, and as an "acoustic film" under other sounds in a playlist. Pairs with White Noise, Brown Noise, Aeroplane in Flight (natural pink).
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ReduxSound v1.0.0
Ambient sound mixer for relaxation and focus