I've been using this app for a while, over a year maybe two, and it has a nice variety of sounds which is why I chose it, but it will randomly shut off in the night waking me up. Never been able to figure out why. Unfortunately I've been having a lot of insomnia lately and after a trying evening I finally fell asleep only to be woken back up 45 minutes later because the sound shut off. So I'm done. I'll find something with a smaller sounds library but works as it should.