✨Sleep Calculator helps you find the best time to go to bed or wake up based on 90-minute sleep cycles. Follow these steps to find your optimal sleep and wake-up time:Choose your desired wake-up time or bedtime.The calculator will compute several recommended times based on full sleep cycles (each about 90 minutes).Pick one that fits your schedule to wake up feeling refreshed.Healthy sleep is composed of several repeating 90-minute cycles including light sleep, deep sleep, and REM sleep. Completing full cycles helps you avoid waking during deep sleep stages, which can cause grogginess.