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"Pink Noise" Better Than "White Noise" for Sleep

pink noise leads to deeper sleep at night

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    Pink noise has a deeper sound than white noise; it's similar to the sounds that waterfall makes. Older people exposed to pink noise at night remembered almost 70% percent more words in a memory recall test than people not exposed to it.

    From the article "Sounds for sleeping: is pink (noise) the new white?" By Sleep Junkies