ZZZcalc.com
Bedtime calculator based on 90-minute sleep cycles
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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.
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