Sleep Calculator | 90 Minute Cycles Bedtime ToolCalculate Your Perfect Bedtime and Wake-Up TimesFree sleep calculator using 90-minute cycles. Calculate optimal bedtime and wake-up times by age. Science-based tool for better sleep quality.How Sleep Cycles WorkOur sleep calculator uses 90-minute sleep cycles to determine the best times for sleep and wake-up.Sleep Calculator by AgeGet personalized sleep recommendations based on your age and sleep needs.Sleep Calculator by AgeSleep Calculator by Age and WeightSleep Calculator by Age and GenderSleep Cycle Sleep Tracker