[FREE][APP] Sleep Calculator

I’m an indie android developer and recently released an android app.

Summary: The app lets you figure out when to go to sleep, to wake up feeling energized and refreshed. It can set an alarm for you to wake-up in-between sleep cycles and start the day with a clear mind.

Please take a look and tell me your opinion.
All suggestions and reviews are welcome.

PlayStore link: https://play.google.com/store/apps/details?id=com.cycle.sleepcalculator

Thank you very much!