Earlier quoted context omitted.
A (very awesome) band called Vulfpeck actually ran an experiment where they released an album called "Sleepify" that contained then 30 second silent tracks and asked all of their supporters to stream the album on repeat nightly. Their idea was to do this long enough to be able to fund a free tour. If I remember correctly, they ended up netting like $35,000 or something from this before Spotify removed the album.
Now imagine if they'd just put a tiny bit of soft white noise-ish ambience on low volume, and they might have had have a real, persistent hit on their hands. (I have started using an air purifier next to the bed to mask noise in the house and it really helps my sleep).
Pink noise, if anyone's looking. White noise sounds very sharp to me, and I get annoyed by it in few seconds. Pink noise, on the other hand, sounds a bit like sea waves on a beach to me, and I can listen to it indefinitely. A lifesaver at work, when I really need to concentrate.