SleepCycler

What it does

Most sleep calculators just spit out times with no explanation. SleepCycler shows you exactly why each bedtime works — based on 90-minute sleep cycles, your age group, and a 15-minute fall-asleep buffer. Features: bidirectional calculator (wake time or bedtime), Sleep Now button, Sleep Debt Calculator with 7-night tracking and recovery plan, and a full sleep science blog. Free, no signup, no ads.

Calculate the best time to go to sleep or wake up based on 90-minute sleep cycles. Free, science-backed sleep calculator.

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