Sleep Cycle - Sleep Calculator by MYSTIC MOBILE APPS LLC
Sleep Calculator Pro on the App Store
Sleep Time Calculator - Sleep Cycle Calculator - Sleepcalc.me
WellAdvantage - If you're aiming for 7 to 9 hours of sleep each night, a sleep calculator can help you figure out what time to go to bed based on your wake-up
Sleep Calculator: How Much Sleep You Need | Sleep.com
Sleep Calculator - Apps on Google Play
This Sleep Calculator Finds You The Perfect Time To Go To Bed | HuffPost Life
This 'sleep calculator' will tell you exactly when to go to bed for the perfect night's sleep | For The Win