Tinnitus

That's not a bad idea...

Rainy nights really help me sleep, which is a similar sound.

yea at night time when it can be a real pain. I tune a  FM radio beside my bed  to white noise (no radio station). 

I also have tinnitus, for as long as I can remember. Usually it's drowned out by other sounds but it does affect me quite often at night when everything else is quiet.

i have tinnitus, its really common. As long as it isn't  pulsate tinnitus it should not really harm you. But it does get annoying at times. I can suppress it with white noise if it gets loud.  I just ignore it as best I can which seems to be the best strategy.