Download on the App Store: https://apps.apple.com/us/app/good-time-sleep-calculator/id1510846801
Good Time — Sleep Calculator helps you to wake up feeling fresh and energetic every morning by calculating time to go to bed & time to wake up.
* Find your best time to wake up if you get in bed right now
* Select when you want to wake up and calculate your time to go to bed
* Set a kind reminder not to forget planned bedtime
* Get sleeping tips
Algorithm is based on a common knowledge that average sleep cycle lasts about 90 minutes.