Why Does White Noise Make You Fall Asleep?

Many people report that listening to white noise helps them fall and stay asleep. Why exactly does it work?

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Why Does White Noise Help People Sleep?
http://www.popsci.com/article/science/fyi-why-does-white-noise-help-people-sleep
"On its face, flipping on white noise before hitting the sack must be the most counterintuitive idea out there. Want to sleep better? Simple solution: make a bunch of noise. Sweet dreams ahoy."

White, Pink, Blue and Violet: The Colours of Noise
http://www.wired.co.uk/news/archive/2011-04/7/colours-of-noise
"Ever wondered why white noise is white? It's not the only colour of noise you can get. There are a handful of others too -- which are used in a variety of different situations, including acoustics testing, electrical engineering and hard physics."

What Is Pink Noise?
http://www.livescience.com/38464-what-is-pink-noise.html
"Pink noise is a color of noise, not entirely unlike white noise. Both white noise and pink noise contain all the frequencies that are audible to humans - 20 hertz to 20,000 hertz - but the way their signal power is distributed among those frequencies differs."
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