I was having trouble going back to sleep at 1:45 am so looked for an app that might help. I found and downloaded this app, found a rain on the roof option, set it for 20 minutes and was back to sleep before it ended. There are many different water sounds and others which I am only now exploring. I anticipate that I will use this app often and not just to help me sleep.
SofieGirl11 about Sleep Sounds HQ: relaxing aid