ZZZCalc calculates the ideal time to go to bed or wake up based on 90-minute sleep cycles plus the average 14 minutes it takes to fall asleep. Most bedtime advice ignores sleep cycles entirely — waking mid-cycle causes grogginess no matter how many hours you slept. Features: bedtime calculator, wake-up calculator, shift worker mode, and nap calculator. Completely free, no account required.
I built ZZZCalc because most bedtime advice ignores sleep cycles. If you wake up mid-cycle you feel groggy no matter how many hours you slept. This calculator adds 14 minutes fall-asleep time to 90-minute cycles to give you the exact times to aim for. Shift worker mode and nap calculator included. Completely free, no sign-up.
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