BRAIN SLEEP COIN is a health & fitness app by BRAIN SLEEP with 10,000+ downloads (about 17K estimated). +28 installs in the last 7 days. Install growth, rank history, SDKs and ad networks.
From the store listing: “It analyzes your sleep status and helps you improve your sleep habits. The better you sleep, the more coins you will earn and you can redeem them for discount coupons for great deals and services.”