If there's something that calms me down is the steady noise of rainfall.
Not long ago I was in one of those situations where you're trying to sleep, but all you manage to do is close your eyes and turn around in bed countless times till you end up belly up looking at the ceiling asking nobody "why can't I sleeeeeeeeep?"
So I got up and googled rain sound. Came across this very simple website Rainy Mood which plays rain and thunder noises in an endless loop.
It has over 400,000 likes on Facebook and a bunch of retweets, so it seems there are a lot of people out there who like going to sleep with the rain. All you need is a good set of speakers and a little power of abstraction to forget the fact it's coming from your computer.