Sleep Calculator - go to sleep and wake up feeling energized and refreshed
HealthCalcApp
Sleep Calculator
Sleep Calculator: Ideal Bedtime & Wake Up Times - Sleepytime
SleepTiming: Sleep Calculator to Help You Wake Up
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: When Should You Go to Bed or Wake Up?