On: How to Sleep

[lozf]

If you have sox (free, cross platform, open source) installed, you can run e.g.:

     play -n synth 08:00:00 pinknoise 

for 8 hours of noise -- you might prefer either whitenoise or brownnoise, and maybe play around with the eq or other effect options to modulate the output if you want a little variation. If you skip the duration it'll play til you ^C.

[lucb1e → lozf]

Or ocean waves with sox:

    play -n synth brownnoise synth pinknoise mix synth sine amod 0.3 10

Via: https://askubuntu.com/a/789472/111115