A mobile app for sleeping

I've recently found a mobile app on facebook which helps falling asleep,
I'd like to share here with you all, but I'm not sure about this forum's rule,
am I allowed to do that actually?

The app is about leading your breathing into the most relaxing state, so that you can fall asleep easily. It sounds to me that it is kind of stunning but making sense to me.
But seems the app not released to App Store yet, you may search in google