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 distributed evenly across octaves rather than across frequencies (as in white noise), which matches how the human ear naturally perceives sound. Pink therefore feels warmer and fuller than white: less hiss in the highs, more rumble in the lows.
This is the most thoroughly 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. Later work by Papalambros and colleagues (Frontiers in Human Neuroscience, 2017) demonstrated that pink noise synchronised with one's own slow brain waves improves overnight memory consolidation in older adults by around 30% versus control. That is one of the strongest non-pharmacological sleep effects known to modern science.
Pink noise also appears throughout nature: a steady waterfall, wind in leaves and coastal surf are all spectrally close to it. Use this track for sleep (especially if you can't tolerate the harshness of white noise), for 20-minute power naps, for long focused sessions such as programming or academic writing, to mask neighbour noise, for tinnitus relief, and as an acoustic underlay beneath other sounds in a playlist. Pairs with White Noise, Brown Noise and Aeroplane in Flight (which is natural pink).
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ReduxSound v1.0.0
Ambient sound mixer for relaxation and focus