I came across this while searching for how to sleep better. Seeing that this is a thing tells a lot about how people are having a hard time fixing their sleep. There are sounds like these on our phones, but relying on that can lead you to use other apps. Since these are below $50, it's not so bad to try and have one. Do you think it's practical, though?
It seems to me that it's like the opposite of an alarm clock. Maybe people who don't have noise-proof rooms will find this helpful. I wouldn't buy it, though, because I can sleep easily once the lights are out.
It depends on what they sound like. I've found some that are incredibly obnoxious, like the ones that make white noise. I can handle a good rainstorm or ocean waves though.
It's practical for our times because lots of people have a hard time getting some good sleep. We might only be underestimating sleep's importance, but buying anything to improve that should be a must.