It's incredible. I've been attracted by weird sounds (vacuum cleaners, humidifiers and hair dryer) since I was a kid. That noise sends shivers down my spine, then my body feels completely relaxed. No side effects so far.

https://simplynoise.com/

https://www.youtube.com/watch?v=i5w8Vle2a0Y

EDIT: I agree with user ralmeida, I prefer brown over white noise. Analogy: pure white noise is coffee (focus, awareness, stress), brown and variable patterns feel like a soothing massage.